[docs] Remove AWS App Mesh from feature status

[t-kikuc]

What this PR does / why we need it:

We will not support App Mesh because AWS will terminate it on September 30th, 2026.

cf. https://aws.amazon.com/jp/blogs/containers/migrating-from-aws-app-mesh-to-amazon-ecs-service-connect/.

we have made the decision to discontinue support for AWS App Mesh, effective September 30th, 2026.

Which issue(s) this PR fixes:

N/A

Does this PR introduce a user-facing change?:

• How are users affected by this change:
• Is this breaking change:
• How to migrate (if breaking change):

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 22.90%. Comparing base (32b33b4) to head (b540023).
Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5234      +/-   ##
==========================================
- Coverage   22.91%   22.90%   -0.01%     
==========================================
  Files         419      419              
  Lines       45321    45323       +2     
==========================================
- Hits        10385    10383       -2     
- Misses      34139    34142       +3     
- Partials      797      798       +1     

Flag	Coverage Δ
	22.90% <ø> (-0.01%)	⬇️

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[khanhtc1202]

Thanks 👍

[Warashi]

Thank you 👍🏻