TechDebt: "go mod" and "go generate" CI checks conflicting

[jar-b]

Description

There is a conflict between the "go mod" and "go generate" CI checks at the moment. The former thinks that github.com/dlclark/regexp2 should be removed when tidying modules, but the latter fails due to a missing dependency when it is.

Error: ../../generate/tagstests/main.go:24:2: no required module provides package github.com/dlclark/regexp2; to add it:
	go get github.com/dlclark/regexp2

Both of these checks occurred at various stages in #45251:

Failing deps check: https://github.com/hashicorp/terraform-provider-aws/actions/runs/19682533912/job/56379863155
Failing generate check: https://github.com/hashicorp/terraform-provider-aws/actions/runs/19683951474/job/56385565752?pr=45251

Important Facts and References

No response

Would you like to implement a relevant change?

No

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[ewbankkit]

I think it's the change from

//go:build generate

to

//go:build ignore

in internal/generate/identitytests/main.go and internal/generate/tagstests/main.go made in #45215 that has caused the problem with make gen.

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[github-actions]

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