fix: repair go-generate mock generation for pegomock v4

[mateenali66]

Summary

• Add explicit package import path to pegomock generate directives in server/controllers/events/ and server/controllers/web_templates/
• Pegomock v4 uses go/packages to resolve interfaces, which fails when only the bare interface name is provided without a package path
• This matches the pattern already used by working directives in server/events/ (e.g., project_command_builder.go)

Fixes #4664

Related upstream: petergtz/pegomock#127

Files changed

• server/controllers/events/azuredevops_request_validator.go (reported in go-generate step is broken #4664)
• server/controllers/events/github_request_validator.go
• server/controllers/events/gitlab_request_parser_validator.go
• server/controllers/web_templates/web_templates.go

Test plan

• Run go generate ./server/controllers/events/... and verify mocks are regenerated without panic
• Run go generate ./server/controllers/web_templates/... and verify mock is regenerated
• Verify existing tests still pass

[Copilot]

Pull request overview

Repairs go generate mock generation for pegomock v4 by updating //go:generate directives in controller packages to include an explicit input package import path, matching the pattern already used in other working directives.

Changes:

• Updated pegomock generate directives in server/controllers/events/ to pass github.com/runatlantis/atlantis/server/controllers/events explicitly.
• Updated pegomock generate directive in server/controllers/web_templates/ to pass github.com/runatlantis/atlantis/server/controllers/web_templates explicitly.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
server/controllers/events/azuredevops_request_validator.go	Adds explicit package import path to pegomock generate directive to avoid interface resolution failure.
server/controllers/events/github_request_validator.go	Adds explicit package import path to pegomock generate directive to avoid interface resolution failure.
server/controllers/events/gitlab_request_parser_validator.go	Adds explicit package import path to pegomock generate directive to avoid interface resolution failure.
server/controllers/web_templates/web_templates.go	Adds explicit package import path to pegomock generate directive to avoid interface resolution failure.

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