Update copilot instruction file

[khanhtc1202]

What this PR does:

Add more detail to copilot instruction

Why we need it:

Which issue(s) this PR fixes:

Fixes #

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 29.36%. Comparing base (8671bd5) to head (717917c).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #7097   +/-   ##
=======================================
  Coverage   29.36%   29.36%           
=======================================
  Files         601      601           
  Lines       64328    64328           
=======================================
  Hits        18891    18891           
  Misses      43969    43969           
  Partials     1468     1468           

Flag	Coverage Δ
.	23.12% <ø> (ø)
.-pkg-app-pipedv1-plugin-analysis	32.43% <ø> (ø)
.-pkg-app-pipedv1-plugin-ecs	31.74% <ø> (ø)
.-pkg-app-pipedv1-plugin-kubernetes	58.39% <ø> (ø)
.-pkg-app-pipedv1-plugin-kubernetes_multicluster	59.62% <ø> (ø)
.-pkg-app-pipedv1-plugin-scriptrun	54.83% <ø> (ø)
.-pkg-app-pipedv1-plugin-terraform	38.46% <ø> (ø)
.-pkg-app-pipedv1-plugin-wait	33.04% <ø> (ø)
.-pkg-app-pipedv1-plugin-waitapproval	52.71% <ø> (ø)
.-pkg-plugin-sdk	50.34% <ø> (ø)
.-tool-actions-gh-release	19.23% <ø> (ø)
.-tool-actions-plan-preview	25.51% <ø> (ø)
.-tool-codegen-protoc-gen-auth	0.00% <ø> (ø)

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[t-kikuc]

LGTM.
not critical file