chore: Enable OAuth token test

[lantoli]

Description

Enable OAuth token test

Link to any related issue(s): CLOUDP-347669

Type of change:

• Bug fix (non-breaking change which fixes an issue). Please, add the "bug" label to the PR.
• New feature (non-breaking change which adds functionality). Please, add the "enhancement" label to the PR. A migration guide must be created or updated if the new feature will go in a major version.
• Breaking change (fix or feature that would cause existing functionality to not work as expected). Please, add the "breaking change" label to the PR. A migration guide must be created or updated.
• This change requires a documentation update
• Documentation fix/enhancement

Required Checklist:

• I have signed the MongoDB CLA
• I have read the contributing guides
• I have checked that this change does not generate any credentials and that they are NOT accidentally logged anywhere.
• I have added tests that prove my fix is effective or that my feature works per HashiCorp requirements
• I have added any necessary documentation (if appropriate)
• I have run make fmt and formatted my code
• If changes include deprecations or removals I have added appropriate changelog entries.
• If changes include removal or addition of 3rd party GitHub actions, I updated our internal document. Reach out to the APIx Integration slack channel to get access to the internal document.

Further comments

[Copilot]

Pull Request Overview

This PR enables OAuth token testing by adding infrastructure to generate OAuth2 access tokens and running the previously skipped TestAccAccessToken_basic test in CI. The change removes the CI skip condition and adds the necessary tooling to generate valid access tokens during test execution.

• Removes CI skip for OAuth token test that was previously disabled due to token validity constraints
• Adds OAuth2 token generation tool for creating access tokens from service account credentials
• Integrates token generation into the CI workflow to enable automated OAuth testing

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
tools/generate-oauth2-token/main.go	New utility to generate OAuth2 access tokens from service account credentials
internal/provider/provider_authentication_test.go	Removes CI skip condition for OAuth token test
Makefile	Adds target for OAuth2 token generation
.github/workflows/acceptance-tests-runner.yml	Integrates token generation and OAuth test execution in CI workflow

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[EspenAlbert]

Interesting way of creating multiline variable. I guess access token spans multiple lines?

[lantoli]

it's not because multi-line but because characters that need to be escaped so heredoc is used

[EspenAlbert]

Nice

[marcosuma]

just making sure we're not accidentally exposing tokens/secrets

[marcosuma]

just double checking: no token will be output in the console, right?

[manupedrozo]

Can check last run logs: link - all good 👌

[lantoli]

correct, it'll show the typical ***