test(manager): introduce Manager installation test on different OS (backport #7456)

[mergify]

Closes scylladb/scylla-manager#3852

The test is designed for execution on non-main OS distributions (for example, debian10) where the main goal is to execute installation test and verify manager + agent are up and running.

The motivation of having such a test:

• We have never faced OS-specific failures in backup/restore/repair functionality. Thus, there is no need to run the sanity test (which includes these functionality verification) against non-main operation systems;
• Installation test takes only 20 minutes in average against ~2 hours for Manager sanity test;
• The Manager sanity is still here and will be executed on the main OS - Ubuntu 22.

Testing

• The folder with Manager installation jobs (https://jenkins.scylladb.com/view/staging/job/scylla-staging/job/mikita/job/sct/job/manager-master/job/installation-tests/)

PR pre-checks (self review)

• I added the relevant backport labels
• I didn't leave commented-out/debugging code

Reminders

• Add New configuration option and document them (in sdcm/sct_config.py)
• Add unit tests to cover my changes (under unit-test/ folder)
• Update the Readme/doc folder relevant to this change (if needed)

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This is an automatic backport of pull request #7456 done by [Mergify](https://mergify.com).