Add polling to wait for post plan tasks to complete in remote backend

[Maed223]

Backporting this fix to 1.11

Target Release

1.11.3

CHANGELOG entry

• This change is user-facing and I added a changelog entry.
• This change is not user-facing.

[dsa0x]

@Maed223 I think could you could have added the backport tag to the original PR, and the backport assistant will create a PR like this.

Just a future FYI (unless there is another reason why that approach is undesired)

[Maed223]

@dsa0x , thanks for the call out on that. Was not familiar with that workflow!

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