Backport: Compose Metadata Analyzer: Use v2 URL

[valentijnscholten]

Description

Use Composer Repository V2 url for metadata as v1 is deprecated and becoming readonly soon. V1 endpoint will be removed from packagist later this year. This PR removes V1 metadata handling from DT.

Addressed Issue

Fixes #2337
Backports #4470

Additional Details

The metadata being returned for V2 has the same format as V1, except that the releases for a package are returned as an Array instead of a JSONObject.

One thing that changed is how non-existing (or no longer existing) packages are being handled:

• V1: We got a json metadata response with some packages, but it didn't include the requested package (Composer Meta Analyzer Exceptions #2134)
• V2: We get a 404

I added a new unit test for the 404 scenario. I also removed the V1 unit test because I don't have a real world example of this happening in V2. Or should that unit test remain in place with some dummy package just to make sure we don't regress on this code path in the future?

Checklist

• I have read and understand the contributing guidelines
• This PR fixes a defect, and I have provided tests to verify that the fix is effective
• This PR implements an enhancement, and I have provided tests to verify that it works as intended
• This PR introduces changes to the database model, and I have added corresponding update logic
• This PR introduces new or alters existing behavior, and I have updated the documentation accordingly

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00% (target: -1.00%)	✅ 100.00% (target: 70.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (99fbe87)	22593	17894	79.20%
Head commit (f275544)	22594 (+1)	17895 (+1)	79.20% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#4485)	9	9	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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