fix: delete already refunded fees from state if some fee cannot be refunded on channel closure (backport #6255)

[mergify]

Description

While refunding fees for a packet on channel closure, some fees could be refunded and some not. Those fees that are refunded should be deleted from state, so that there is no possibility of them being refunded again if the packet fee information for a packet is used somehow.

closes: #XXXX

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Summary by CodeRabbit

• Refactor
  • Updated logic in RefundFeesOnChannelClosure function to handle unrefunded fees by storing them in a new slice and updating packet fees accordingly.
• Bug Fixes
  • Fixed a bug where refunded fees were not deleted from the state if some fees could not be refunded during channel closure.

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This is an automatic backport of pull request #6255 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 500765e has failed:

On branch mergify/bp/release/v7.5.x/pr-6255
Your branch is up to date with 'origin/release/v7.5.x'.

You are currently cherry-picking commit 500765e4.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   modules/apps/29-fee/keeper/escrow.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   CHANGELOG.md
	both modified:   modules/apps/29-fee/keeper/escrow_test.go

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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