fix: use getUrlFromOP() for fixes links

[richardlau]

When parsing fixes links, use the same code that is used for parsing
the refs and PR-URL links. This avoids the manual URL construction
that was inserting bad links into the metadata for the npm update pull
requests.

Refs: nodejs/node#42382 (comment)

---

This is an alternative to #612 which also fixes the case in #612 (comment).

[codecov]

Codecov Report

Merging #614 (53582bd) into main (5e85166) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #614      +/-   ##
==========================================
- Coverage   84.10%   84.09%   -0.01%     
==========================================
  Files          37       37              
  Lines        4051     4049       -2     
==========================================
- Hits         3407     3405       -2     
  Misses        644      644              

Impacted Files	Coverage Δ
lib/links.js	91.86% <100.00%> (-0.14%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 5e85166...53582bd. Read the comment docs.

[mhdawson]

LGTM

[richardlau]

Anyone have any ideas about the coverage drop/failure? Are we able to land with this check failing?

FWIW TIL that npx node-core-utils runs the equivalent of git node metadata. For nodejs/node#42550:

$ npx node-core-utils 42550
npx: installed 493 in 17.679s
✔  Done loading data for nodejs/node/pull/42550
----------------------------------- PR info ------------------------------------
Title      deps: upgrade npm to 8.6.0 (#42550)
   ⚠  Could not retrieve the email or name of the PR author's from user's GitHub profile!
Branch     npm-robot:npm-8.6.0 -> nodejs:master
Labels     npm, fast-track, needs-ci, dont-land-on-v12.x, dont-land-on-v14.x
Commits    1
 - deps: upgrade npm to 8.6.0
Committers 1
 - npm team <[email protected]>
------------------------------ Generated metadata ------------------------------
PR-URL: https://github.com/nodejs/node/pull/42550
Fixes: https://github.com/remove
Fixes: https://github.com/100%
Fixes: https://github.com/make
Fixes: https://github.com/move
Fixes: https://github.com/really
Fixes: https://github.com/consolidate
Fixes: https://github.com/consolidate
Fixes: https://github.com/consolidate
Fixes: https://github.com/consolidate
Fixes: https://github.com/bump
Fixes: https://github.com/return
Fixes: https://github.com/consolidate
Fixes: https://github.com/work
Fixes: https://github.com/only
Reviewed-By: Rich Trott <[email protected]>
Reviewed-By: Mestery <[email protected]>
Reviewed-By: Mohammed Keyvanzadeh <[email protected]>
Reviewed-By: Tierney Cyren <[email protected]>
--------------------------------------------------------------------------------
   ℹ  This PR was created on Thu, 31 Mar 2022 22:43:19 GMT
   ✔  Approvals: 4
   ✔  - Rich Trott (@Trott) (TSC): https://github.com/nodejs/node/pull/42550#pullrequestreview-928307710
   ✔  - Mestery (@Mesteery): https://github.com/nodejs/node/pull/42550#pullrequestreview-928452353
   ✔  - Mohammed Keyvanzadeh (@VoltrexMaster): https://github.com/nodejs/node/pull/42550#pullrequestreview-928474922
   ✔  - Tierney Cyren (@bnb): https://github.com/nodejs/node/pull/42550#pullrequestreview-928474971
   ℹ  This PR is being fast-tracked
   ✔  Last GitHub CI successful
   ℹ  Last Full PR CI on 2022-04-01T08:44:02Z: https://ci.nodejs.org/job/node-test-pull-request/43255/
✔  Build data downloaded
   ✔  Last Jenkins CI successful

while with this PR:

$ node bin/get-metadata.js 42550
✔  Done loading data for nodejs/node/pull/42550
----------------------------------- PR info ------------------------------------
Title      deps: upgrade npm to 8.6.0 (#42550)
   ⚠  Could not retrieve the email or name of the PR author's from user's GitHub profile!
Branch     npm-robot:npm-8.6.0 -> nodejs:master
Labels     npm, fast-track, needs-ci, dont-land-on-v12.x, dont-land-on-v14.x
Commits    1
 - deps: upgrade npm to 8.6.0
Committers 1
 - npm team <[email protected]>
------------------------------ Generated metadata ------------------------------
PR-URL: https://github.com/nodejs/node/pull/42550
Reviewed-By: Rich Trott <[email protected]>
Reviewed-By: Mestery <[email protected]>
Reviewed-By: Mohammed Keyvanzadeh <[email protected]>
Reviewed-By: Tierney Cyren <[email protected]>
--------------------------------------------------------------------------------
   ℹ  This PR was created on Thu, 31 Mar 2022 22:43:19 GMT
   ✔  Approvals: 4
   ✔  - Rich Trott (@Trott) (TSC): https://github.com/nodejs/node/pull/42550#pullrequestreview-928307710
   ✔  - Mestery (@Mesteery): https://github.com/nodejs/node/pull/42550#pullrequestreview-928452353
   ✔  - Mohammed Keyvanzadeh (@VoltrexMaster): https://github.com/nodejs/node/pull/42550#pullrequestreview-928474922
   ✔  - Tierney Cyren (@bnb): https://github.com/nodejs/node/pull/42550#pullrequestreview-928474971
   ℹ  This PR is being fast-tracked
   ✔  Last GitHub CI successful
   ℹ  Last Full PR CI on 2022-04-01T08:44:02Z: https://ci.nodejs.org/job/node-test-pull-request/43255/
✔  Build data downloaded
   ✔  Last Jenkins CI successful

[targos]

Are we able to land with this check failing?

Yes. I'll land.