refactor(bastion-ssh-config): Centralize bastion_port default value

[legitYosal]

Move the hardcoded default port (22) from the set_fact task in tasks/main.yml to defaults/main.yml as bastion_ssh_port_default to improve maintainability and adhere to variable definition best practices.

/kind cleanup

What this PR does / why we need it:
#11822

Which issue(s) this PR fixes:
#11822
Fixes #11822

Special notes for your reviewer:

Does this PR introduce a user-facing change?:
NONE

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[yankay]

/ok-to-test

[VannTen]

The thing is, this does not remove the default filter (and such case with hostvars can be a acceptable usage, as there is no way to access defaults/vars through hostvars (that I know of)

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PR needs rebase.

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/lifecycle rotten