Add shipper to version bump CI

[fearful-symmetry]

What does this PR do?

This is my first PR on the automation side of things, apologies if I break something. This adds the elastic-agent-shipper to the version bump automation. We already have the bash script in place on the repo side.

Related issues

Related: elastic/elastic-agent-shipper#4

[apmmachine]

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Build stats

• Start Time: 2022-04-29T16:44:53.757+0000

• Duration: 8 min 0 sec

Test stats 🧪

Test	Results
Failed	0
Passed	1428
Skipped	2
Total	1430

💚 Flaky test report

Tests succeeded.

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[v1v]

💯

[v1v]

This will run automatically in the next timer build. https://apm-ci.elastic.co/job/apm-shared/job/bump-go-release-version-pipeline/ early next week (it runs once a week, early mondays)

Thanks for you contribution!