feat: deprecate ottl field in subs and bridges with condition

[csatib02]

Overview

Breaking Changes & Feature

• This PR adds the condition field to subscriptions and bridges, at the same time it deprecates the previous ottl field.
• More about this can be found here: [connector/routing] Add support for OTTL conditions open-telemetry/opentelemetry-collector-contrib#35731

Testing & Miscellaneous

• Added unit tests to verify the new feature and adjusted existing ones accordingly.
• Added a new end-to-end (e2e) test for bridges (this was a leftover I had forgotten to include in my previous PR).
• Fixed some minor issues (ref: f51a0cd).

[VincentS]

Could you add some additional documentation / examples of the thing you added for users ?

[csatib02]

Hi @VincentS,

I've just completed this PR, so the description is filled out.

Cheers