Hide --base-path flag for install sub-command

[ycombinator]

What does this PR do?

This PR "reverts" the feature introduced in #2500 by hiding the --base-path CLI flag for the install sub-command.

The rest of the changes introduced in #2500 and it's follow up PR, #2567, are preserved to allow us to easily reintroduce this feature at a later time.

Why is it important?

The --base-path value has no effect on the installation base path of Endpoint. As such, we don't want to release a half-baked feature that only works for some Agent-managed components but not all.

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation: Revert "Add instructions on customizing installation base path for Elastic Agent" ingest-docs#189
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in ./changelog/fragments using the changelog tool: Feature is being reverted from same release it was introduced in.
• I have added an integration test or an E2E test

[mergify]

This pull request does not have a backport label. Could you fix it @ycombinator? 🙏
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]

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• Start Time: 2023-05-02T22:02:53.179+0000

• Duration: 19 min 7 sec

Test stats 🧪

Test	Results
Failed	0
Passed	5585
Skipped	21
Total	5606

💚 Flaky test report

Tests succeeded.

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[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	98.551% (68/69)	👍
Files	69.198% (164/237)	👍
Classes	68.304% (306/448)	👍
Methods	54.251% (938/1729)	👍
Lines	39.533% (10622/26869)	👎 -0.046
Conditionals	100.0% (0/0)	💚

[cmacknz]

Thanks!

[cmacknz]

I suppose if we wanted a test for this, we would have a test to ensure the the --base-path argument is ignored or treated as invalid.

[blakerouse]

Easy! Like it!