(fork) ci: run tests without bencher on PRs from fork

[skshetry]

BENCHER_API_TOKEN secret is not available when running from forks, due to which bencher receives empty string and fails.

Eg: https://github.com/treeverse/lakeFS/actions/runs/20267951059/job/58195889535?pr=9805.

This will run make test-go when not the secret is not available.

[Copilot]

Pull request overview

This PR modifies the GitHub Actions workflow to handle test execution gracefully when running from forked repositories. When BENCHER_API_TOKEN is unavailable (as it is for PRs from forks), the workflow now runs tests directly using make test-go instead of failing when attempting to use bencher with an empty token.

Key Changes:

• Added conditional logic to check if BENCHER_API_TOKEN is available before using bencher
• Falls back to running make test-go directly when the token is not present

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[Copilot]

The indentation of the bencher command arguments is inconsistent. Line 67 has an extra space compared to lines 66, 68, and 69, which makes the alignment uneven. All continuation lines should have consistent indentation for better readability.

Suggested change

	--project lakefs \
	--branch "$ref" \
	--testbed "github-${release_slug}" \
	make test-go
	--project lakefs \
	--branch "$ref" \
	--testbed "github-${release_slug}" \
	make test-go

[arielshaqed]

THANKS!

(What Copilot said is true. Welcome to the future, where instead of linters we have AI...)

[skshetry]

@arielshaqed, could you please merge this PR? A few required checks are skipped, so I cannot merge this.

Same with #9805. :)