feat(env): filter variables by prefix

[jongio]

Closes #487

Summary

• add repeatable --prefix filtering to azd app env
• apply the filter to dotenv, shell, JSON, --keys, --all, --write, and --explain
• report a clear message when a filtered text output has no matches

Verification

• go test .\src\cmd\app\commands -run "Test(NewEnvCommand|FilterEnvByPrefixes|RunEnvCommand|RunEnvWrite|RenderAllEnv)"
• mage test
• mage build

[github-actions]

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[codecov]

Codecov Report

❌ Patch coverage is 74.57627% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 60.78%. Comparing base (68b3cae) to head (364106e).

Files with missing lines	Patch %	Lines
cli/src/cmd/app/commands/env.go	74.57%	10 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #490      +/-   ##
==========================================
+ Coverage   60.77%   60.78%   +0.01%     
==========================================
  Files         223      223              
  Lines       28527    28575      +48     
==========================================
+ Hits        17337    17370      +33     
- Misses      10010    10020      +10     
- Partials     1180     1185       +5     

Flag	Coverage Δ
unittests	60.78% <74.57%> (+0.01%)	⬆️

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

Files with missing lines	Coverage Δ
cli/src/cmd/app/commands/env.go	80.76% <74.57%> (-1.83%)	⬇️

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[github-actions]

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When you're done testing:

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Build Info:

• Version: 0.19.5-pr490
• Commit: 364106e
• Release: View pre-release

What to Test:
Please review the PR description and test the changes described there.