fix: Make pollForResponse typesafe to avoid exceptions from unknown requests

[sea-snake]

• Make pollForResponse typesafe to avoid exceptions from unknown requests
• Change signed/transformed request typing from any to unknown
• Remove redundant await where requestId method is used since the method isn't async

Description

Fixes issues with 3rd party Agent and or Identity implementations that didn't return a signed/transformed request in the shape that pollForResponse was expecting since the recent changes in 2.1.3

How Has This Been Tested?

See the automated unit and e2e tests, the pollForResponse implementation doesn't have a unit test but should be covered by the actor unit tests and e2e tests.

Checklist:

• My changes follow the guidelines in CONTRIBUTING.md.
• The title of this PR complies with Conventional Commits.
• I have edited the CHANGELOG accordingly.
• I have made corresponding changes to the documentation.