[7.17](backport #38736) Fix the dynamic step for pipeline upload on the x-pack Heartbeat

[mergify[bot]]

This PR fixes the x-pack heartbeat buildkite pipeline

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This is an automatic backport of pull request #38736 done by Mergify.

[botelastic[bot]]

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[elasticmachine]

:green_heart: Build Succeeded

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• Start Time: 2024-05-02T12:45:53.664+0000

• Duration: 12 min 7 sec

Test stats :test_tube:

Test	Results
Failed	0
Passed	3
Skipped	0
Total	3

:green_heart: Flaky test report

Tests succeeded.

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[mergify[bot]]

This pull request has not been merged yet. Could you please review and merge it @alexsapran? 🙏

[mergify[bot]]

This pull request has not been merged yet. Could you please review and merge it @alexsapran? 🙏

[mergify[bot]]

This pull request has not been merged yet. Could you please review and merge it @alexsapran? 🙏

[mergify[bot]]

This pull request has not been merged yet. Could you please review and merge it @alexsapran? 🙏

[alexsapran]

/test