Update go to v1.26.2

[khanhtc1202]

What this PR does:

Since Snyk asked to update Go to v1.26.2 for a security update, I think it's time to migrate all pipecd components to v1.26.

Tested:

• code gen no change (local test only, since this PR introduces new container image, which required to update the codegen CI container image version to ensure running)
• control plane behavior no change
• piped behavior no change

Not yet tested:

• CI workflow (will check by this PR CI)

Uncovered modules:

• None

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

❌ Patch coverage is 50.00000% with 54 lines in your changes missing coverage. Please review.
✅ Project coverage is 29.33%. Comparing base (f52e999) to head (f02d6ee).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
.../app/piped/platformprovider/terraform/terraform.go	0.00%	12 Missing ⚠️
...app/pipedv1/plugin/terraform/provider/terraform.go	0.00%	12 Missing ⚠️
pkg/app/piped/platformprovider/kubernetes/diff.go	0.00%	5 Missing ⚠️
tool/actions-gh-release/release.go	42.85%	4 Missing ⚠️
pkg/app/ops/firestoreindexensurer/gcloud.go	0.00%	3 Missing ⚠️
tool/actions-plan-preview/planpreview.go	0.00%	3 Missing ⚠️
pkg/app/piped/trigger/trigger.go	0.00%	2 Missing ⚠️
pkg/app/pipedv1/trigger/trigger.go	0.00%	2 Missing ⚠️
pkg/app/piped/controller/scheduler.go	0.00%	1 Missing ⚠️
pkg/app/piped/driftdetector/cloudrun/detector.go	0.00%	1 Missing ⚠️
... and 9 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6711      +/-   ##
==========================================
+ Coverage   29.32%   29.33%   +0.01%     
==========================================
  Files         601      601              
  Lines       64190    64204      +14     
==========================================
+ Hits        18822    18834      +12     
+ Misses      43904    43903       -1     
- Partials     1464     1467       +3     

Flag	Coverage Δ
.	23.15% <43.33%> (+0.01%)	⬆️
.-pkg-app-pipedv1-plugin-analysis	32.43% <ø> (ø)
.-pkg-app-pipedv1-plugin-ecs	31.82% <ø> (ø)
.-pkg-app-pipedv1-plugin-kubernetes	58.37% <83.33%> (ø)
.-pkg-app-pipedv1-plugin-kubernetes_multicluster	59.39% <100.00%> (ø)
.-pkg-app-pipedv1-plugin-scriptrun	54.83% <ø> (ø)
.-pkg-app-pipedv1-plugin-terraform	38.18% <7.69%> (+0.23%)	⬆️
.-pkg-app-pipedv1-plugin-wait	33.04% <ø> (ø)
.-pkg-app-pipedv1-plugin-waitapproval	52.71% <ø> (ø)
.-pkg-plugin-sdk	50.34% <100.00%> (ø)
.-tool-actions-gh-release	19.23% <50.00%> (ø)
.-tool-actions-plan-preview	25.51% <0.00%> (ø)
.-tool-codegen-protoc-gen-auth	0.00% <ø> (ø)

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[mohammedfirdouss]

@khanhtc1202 lint issues

[khanhtc1202]

Required to merge the PR #6717 before in order to make gen/code pipeline pass

[khanhtc1202]

NOTE: re-enable codegen CI as a required step after this PR is merged (the codegen container image is generated)

[Warashi]

LGTM