Add pipedv1 and plugin release docs

[khanhtc1202]

What this PR does:

ssia

Why we need it:

We need to note the release flow for pipedv1 and plugins.

Which issue(s) this PR fixes:

Part of #5259
Part of #5530
Part of #4980

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 28.78%. Comparing base (8c1876c) to head (33be932).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6209   +/-   ##
=======================================
  Coverage   28.77%   28.78%           
=======================================
  Files         559      559           
  Lines       59523    59523           
=======================================
+ Hits        17127    17131    +4     
+ Misses      41081    41078    -3     
+ Partials     1315     1314    -1     

Flag	Coverage Δ
.	23.24% <ø> (ø)
.-pkg-app-pipedv1-plugin-analysis	32.64% <ø> (ø)
.-pkg-app-pipedv1-plugin-kubernetes	60.24% <ø> (ø)
.-pkg-app-pipedv1-plugin-kubernetes_multicluster	67.48% <ø> (ø)
.-pkg-app-pipedv1-plugin-scriptrun	54.83% <ø> (ø)
.-pkg-app-pipedv1-plugin-terraform	39.49% <ø> (ø)
.-pkg-app-pipedv1-plugin-wait	35.51% <ø> (ø)
.-pkg-app-pipedv1-plugin-waitapproval	55.73% <ø> (ø)
.-pkg-plugin-sdk	50.37% <ø> (+0.19%)	⬆️
.-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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[khanhtc1202]

@ffjlabo Addressed you suggestion by 1e22f3d

[ffjlabo]

LGTM