chore: enforce eol-last rule

[mrgrain]

Reason for this change

This rule was previously not enforced and implementation inconsistent.
Enforcing a new line at the end of the file makes it easier to append files.

Description of changes

No code changes! Only formatting. 💅🏻

And a bit of config:

• Added a new eslint rule for eol-last
• Added a VSCode seting to automatically insert newlines
• Applied the rule to all non-compliant files

Best reviewed with whitespace changes ignored: https://github.com/aws/aws-cdk/pull/32335/files?w=1

Description of how you validated changes

No code changes, purely formatting.

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

---

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[aws-cdk-automation]

The pull request linter has failed. See the aws-cdk-automation comment below for failure reasons. If you believe this pull request should receive an exemption, please comment and provide a justification.

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[mrgrain]

Applied pr-linter/cli-integ-tested to pass the linter, but didn't run the tests because there is not need to run them since the PR only contains whitespace changes.

✅ Updated pull request passes all PRLinter validations. Dismissing previous PRLinter review.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.42%. Comparing base (dc7574a) to head (1abd85c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #32335      +/-   ##
==========================================
- Coverage   78.46%   78.42%   -0.05%     
==========================================
  Files         106      106              
  Lines        7208     7208              
  Branches     1323     1323              
==========================================
- Hits         5656     5653       -3     
- Misses       1364     1368       +4     
+ Partials      188      187       -1     

Flag	Coverage Δ
suite.unit	78.42% <ø> (-0.05%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
packages/aws-cdk	78.42% <ø> (-0.05%)	⬇️

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 1abd85c
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[github-actions]

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