[7.15](backport #28517) Use fsnotify with long windows name-safe changes

[mergify]

This is an automatic backport of pull request #28517 done by Mergify.
Cherry-pick of cd8fc07 has failed:

On branch mergify/bp/7.15/pr-28517
Your branch is up to date with 'origin/7.15'.

You are currently cherry-picking commit cd8fc07563.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   CHANGELOG.next.asciidoc

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   NOTICE.txt
	both modified:   go.mod
	both modified:   go.sum

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💔 Build Failed

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Build stats

• Start Time: 2021-10-21T09:33:37.545+0000

• Duration: 75 min 21 sec

• Commit: 68aa0ab

Test stats 🧪

Test	Results
Failed	0
Passed	19867
Skipped	1488
Total	21355

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auditbeat-windows-windows-2019 - mage build unitTest

• Took 1 min 43 sec . View more details here
• Description: mage build unitTest

auditbeat-windows-windows-2019 - mage build unitTest

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• Description: mage build unitTest

auditbeat-windows-windows-2019 - mage build unitTest

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• Description: mage build unitTest

gsutil -m -q cp -a public-read build/system-tests-*.tar.gz gs://beats-ci-temp/Beats/beats/PR-28581-3

• Took 0 min 3 sec . View more details here
• Description: @echo off gsutil -m -q cp -a public-read build/system-tests-*.tar.gz gs://beats-ci-temp/Beats/beats/PR-28581-3

x-pack/auditbeat-windows-windows-2019 - mage build unitTest

• Took 2 min 45 sec . View more details here
• Description: mage build unitTest

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• Description: mage build unitTest

x-pack/auditbeat-windows-windows-2019 - mage build unitTest

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• Description: mage build unitTest

gsutil -m -q cp -a public-read build/system-tests-*.tar.gz gs://beats-ci-temp/Beats/beats/PR-28581-3

• Took 0 min 3 sec . View more details here
• Description: @echo off gsutil -m -q cp -a public-read build/system-tests-*.tar.gz gs://beats-ci-temp/Beats/beats/PR-28581-3

x-pack/metricbeat-unitTest - mage build unitTest

• Took 4 min 50 sec . View more details here
• Description: mage build unitTest

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• Description: Error 'hudson.AbortException: script returned exit code 2'

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[efd6]

@adriansr I was not aware that the Go version change was not applied to 7.15. This change cannot build here unless the Go version is bumped which I'm sure we don't want to do.