chore: removes redundant clientId() call during subscriber init

[ganchoradkov]

Description

Removed redundant setting of clientId during subscriber init. The value is still used and required to set subscription IDs but should be fetched when needed instead of during init. This change also has the benefit of speeding up the sdk init

Type of change

• Chore (non-breaking change that addresses non-functional tasks, maintenance, or code quality improvements)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Draft PR (breaking/non-breaking change which needs more work for having a proper functionality [Mark this PR as ready to review only when completely ready])
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

How has this been tested?

tests

Checklist

• I have performed a self-review of my own code
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

Additional Information (Optional)

Please include any additional information that may be useful for the reviewer.

[Cali93]

LGTM