[main] (backport #17875) Make sure FIPS comments belong in the platform-sre Dockerfile

[mergify]

Without this change the FIPS related comment is sneaking into the other Dockerfiles:

https://github.com/elastic/dockerfiles/blob/8.19/logstash/Dockerfile#L45

---

This is an automatic backport of pull request #17875 done by Mergify.

[mergify]

Cherry-pick of 79fac1f has failed:

On branch mergify/bp/main/pr-17875
Your branch is up to date with 'origin/main'.

You are currently cherry-picking commit 79fac1fe.
  (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)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   docker/templates/Dockerfile.erb

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[github-actions]

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Just comment with:

• run docs-build : Re-trigger the docs validation. (use unformatted text in the comment!)

[elastic-sonarqube]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarQube

[elasticmachine]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 1c18a26

Failed CI Steps

• 🛂 License check - Fedramp High Mode
• :rspec: Ruby unit tests - FIPS mode
• :java: Java unit tests - FIPS mode
• :java: Java unit tests - FIPS mode
• Observability SRE container smoke test
• 🥼 Integration Tests - FIPS mode / part 1-of-3
• 🥼 Integration Tests - FIPS mode / part 2-of-3
• 🥼 Integration Tests - FIPS mode / part 3-of-3
• 🥼 x-pack unit tests - FIPS mode
• 🥼 x-pack integration - FIPS mode

cc @jsvd