[CI] automate update-beats

[v1v]

Motivation/summary

Jenkins job that:

1. Runs make update-beats.
2. Stages the changes to go.mod, go.sum, NOTICE.txt.
3. Creates a PR.

ONLY on daily basis for the master branch. If needed, it's possible to trigger it on PR/tag/other-branches using the Jenkins UI.

Mergify does the rest:

• auto-merge
• delete-on-merge bits set

How to test these changes

Within the pipeline itself

Dry Run

No dry run

And created https://github.com/elastic/apm-server/pull/5703/files

NOTE: Bear in mind the PR was created on the top of this PR, that's the reason for having more changes. When running on the master branch, this should not be the case.

Related issues

Closes #4941
Requires #5690

[v1v]

For testing purposes

[v1v]

Some errors with the make update-beats

16:28:00  diff -u .go-version $(/var/lib/jenkins/workspace/_server_update-beats-mbp_PR-5692/.gvm/versions/go1.16.5.linux.amd64/bin/go list -m -f {{.Dir}} github.com/elastic/beats/v7)/.go-version \
16:28:00  	|| { code=$?; echo ".go-version out of sync with Beats"; exit $code; }
16:28:00  /var/lib/jenkins/workspace/_server_update-beats-mbp_PR-5692/.gvm/versions/go1.16.5.linux.amd64/bin/go build -o build/linux/bin/mage github.com/magefile/mage
16:28:01  ./build/linux/bin/mage -compile=build/linux/mage
16:28:33  # github.com/elastic/apm-server/elasticsearch
16:28:33  elasticsearch/config.go:150:17: assignment mismatch: 2 variables but transport.TLSDialer returns 1 values
16:28:33  Error: error compiling magefiles
16:28:33  Makefile:273: recipe for target 'build/linux/mage' failed
16:28:33  make: *** [build/linux/mage] Error 1

[apmmachine]

💚 Build Succeeded

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Build stats

• Start Time: 2021-07-14T08:44:11.513+0000

• Duration: 39 min 35 sec

• Commit: 059ada2

Test stats 🧪

Test	Results
Failed	0
Passed	5961
Skipped	14
Total	5975

Trends 🧪

[axw]

Awesome, thank you very much @v1v! ❤️

[simitt]

Amazing, thank you!

[v1v]

@Mergifyio backport 7.17

[mergify]

backport 7.17

✅ Backports have been created

• #7176 [CI] automate update-beats (backport #5692) has been created for branch 7.17