feat(ado/infra): remove unneeded encoding module from webpack

[karanbirsingh]

Details

This PR follows up from #752 (comment)

It tells webpack to stop including the encoding module. We don't use this code path & encoding is brought in from a devDependency of lerna.

We use the strategy in this comment: node-fetch/node-fetch#412 (comment)

Motivation

Stop including a package we don't use

Context

Pull request checklist

• Addresses an existing issue: Fixes #0000
• Added relevant unit test for your changes. (yarn test)
• Verified code coverage for the changes made. Check coverage report at: <rootDir>/test-results/unit/coverage
• Ran precheckin (yarn precheckin)
• (after PR created) The Accessibility Checks (pull_request) check should fail. All other checks should pass.

[github-actions]

Accessibility Insights Action

• URLs: 1 URL(s) failed, 3 URL(s) passed, and 0 were not scannable
• Rules: 6 check(s) failed, 11 check(s) passed, and 38 were not applicable
• Download the Accessibility Insights artifact to view the detailed results of these checks

Failed instances

• 3 × label: Ensures every form element has a label
• 1 × html-has-lang: Ensures every HTML document has a lang attribute
• 1 × image-alt: Ensures <img> elements have alternate text or a role of none or presentation
• 1 × input-image-alt: Ensures <input type="image"> elements have alternate text

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This scan used axe-core 4.2.1 with Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.75 Safari/537.36.

[codecov-commenter]

Codecov Report

Merging #759 (12fe2f9) into main (eae20c7) will decrease coverage by 0.66%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #759      +/-   ##
==========================================
- Coverage   94.34%   93.68%   -0.67%     
==========================================
  Files          26       27       +1     
  Lines         566      570       +4     
  Branches       54       54              
==========================================
  Hits          534      534              
- Misses         32       36       +4     

Impacted Files	Coverage Δ
packages/ado-extension/src/index.ts	0.00% <0.00%> (ø)

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[AhmedAbdoOrtiga]

packages/gh-action/dist/index.js is still in the branch, please merge with main