ci: update GCP service accounts for CI

[daniel-weisse]

Context

We want to use a separate project for running e2e tests on GCP, as well as restrict the service accounts used for said e2e tests and image builds.

Proposed change(s)

• Update service accounts used for infrastructure creation and IAM creation
• Remove unused gcpInClusterServiceAccountKey account from .github/actions/e2e_test/action.yml
  • This secret should also be deleted from this repo
• Update project used for deploying e2e tests
  • We currently have this saved as a secret, making updating it rather difficult without breaking things
  • For now, I just hard coded the new project. We can either keep it like this, or change back to using a secret and update the secret in this repo before merging
• Update the service account used to build images (previously constellation-cos-builder)
  • image-deleter to delete images built on feature/testing branches after they were merged
  • image-uploader to upload images built on feature/testing branches to GCP
• Update dev-docs

Additional info

• AB#3552
• e2e test GCP
• e2e test GCP Terraform module
• e2e test GCP self-managed
• image build pipeline
• image deletion pipeline was tested locally using the image-deleter service account and the versionsapi CLI

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[daniel-weisse]

self-managed resources seem to not be cleaned up properly, but this should unrelated to this PR
Will investigate

[github-actions]

Coverage report

Package	Old	New	Trend
image/upload/internal/cmd	[no test files]	[no test files]	🚧