[7.17] (backport elastic-agent#680) Fix transpiler to allow : in dynamic variables.

[michel-laterman]

Backport elastic/elastic-agent#680

Fix transpiler regex to allow ':' characters in dynamic variables so
that users can input "${dynamic.lookup|'fallback.here'}".

[elasticmachine]

Pinging @elastic/elastic-agent-control-plane (Team:Elastic-Agent-Control-Plane)

[elasticmachine]

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• Start Time: 2022-07-26T20:10:33.596+0000

• Duration: 114 min 47 sec

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Total	6531

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[AndersonQ]

@michel-laterman I believe it'd be better for the same reviewers of the original PR (elastic/elastic-agent#680) to review this backport.

[ph]

Small comment here, this mean the following variable declaration would be valid:

${dynami:c.lookup|'fallback.here'}

dynami:c.lookup seems weird to me, but again... this is still a valid key reference in YAML if you quote the key value.

'test:ok': hello

[michel-laterman]

yeah! yaml? 😕

[ph]

I had yaml with a passion, not sure it was better than xml ;)

[mergify]

This pull request is now in conflicts. Could you fix it? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b backport-agent-680 upstream/backport-agent-680
git merge upstream/7.17
git push upstream backport-agent-680

[michel-laterman]

e2e tests in https://beats-ci.elastic.co/blue/organizations/jenkins/Beats%2Fpackaging/detail/PR-32407/4/pipeline/ passed