feat(samples/cloudwatch-applicationsignals-mcp): add ecs samples for enablement testing

[wangzlei]

Fixes

Summary

Adding ECS samples for Python, Node.js and Java for APM enablement tool testing infra.

Changes

This PR adds ECS baseline applications for testing APM enablement via the get_enablement_guide MCP tool.

User experience

N/A

Checklist

If your change doesn't seem to apply, please leave them unchecked.

• I have reviewed the contributing guidelines
• I have performed a self-review of this change
• Changes have been tested
• Changes are documented

Is this a breaking change? (Y/N)

RFC issue number:

Checklist:

• Migration process documented
• Implement warnings (if it can live side by side)

Acknowledgment

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of the project license.

[yiyuan-he]

LGTM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.23%. Comparing base (ca2491e) to head (42013b3).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1727      +/-   ##
==========================================
- Coverage   90.26%   90.23%   -0.03%     
==========================================
  Files         781      739      -42     
  Lines       59912    58108    -1804     
  Branches     9718     9570     -148     
==========================================
- Hits        54077    52434    -1643     
+ Misses       3646     3504     -142     
+ Partials     2189     2170      -19     

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