Remove non-agent Dockerfile templates.

[cmacknz]

These are only used for Beats and should have been deleted when the agent migrated to its own repository.

[mergify]

This pull request does not have a backport label. Could you fix it @cmacknz? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-v./d./d./d is the label to automatically backport to the 8./d branch. /d is the digit

NOTE: backport-skip has been added to this pull request.

[elasticmachine]

💚 Build Succeeded

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Build stats

• Start Time: 2022-11-02T15:47:32.102+0000

• Duration: 41 min 36 sec

Test stats 🧪

Test	Results
Failed	0
Passed	5019
Skipped	17
Total	5036

💚 Flaky test report

Tests succeeded.

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• /test : Re-trigger the build.

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[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	97.297% (72/74)	👍
Files	69.13% (159/230)	👍
Classes	69.231% (315/455)	👍
Methods	53.254% (892/1675)	👍
Lines	39.307% (9635/24512)	👎 -0.008
Conditionals	100.0% (0/0)	💚

[cmacknz]

/package

[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 delete-unnecessary-dockerfile upstream/delete-unnecessary-dockerfile
git merge upstream/main
git push upstream delete-unnecessary-dockerfile

[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 delete-unnecessary-dockerfile upstream/delete-unnecessary-dockerfile
git merge upstream/main
git push upstream delete-unnecessary-dockerfile

[blakerouse]

Looks good.