feat: discard pending rollapp ibc packets upon fraud

[mtsitrin]

Description

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Closes #624

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I have...

• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• Targeted PR against the correct branch
• included the correct type prefix in the PR title
• Linked to the GitHub issue with discussion and accepted design
• Targets only one GitHub issue
• Wrote unit and integration tests
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• Added relevant godoc comments
• Updated the scripts for local run, e.g genesis_config_commands.sh if the PR changes parameters
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SDK Checklist

• Import/Export Genesis
• Registered Invariants
• Registered Events
• Updated openapi.yaml
• No usage of go map
• No usage of time.Now()
• Used fixed point arithmetic and not float arithmetic
• Avoid panicking in Begin/End block as much as possible
• No unexpected math Overflow
• Used sendCoin and not SendCoins
• Out-of-block compute is bounded
• No serialized ID at the end of store keys
• UInt to byte conversion should use BigEndian

Full security checklist here

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• Confirmed the correct type prefix in the PR title
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After reviewer approval:

• In case the PR targets the main branch, PR should not be squash merge in order to keep meaningful git history.
• In case the PR targets a release branch, PR must be rebased.

[codecov]

Codecov Report

Attention: Patch coverage is 81.25000% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 29.97%. Comparing base (f76fc29) to head (d164d5d).

Files	Patch %	Lines
x/delayedack/keeper/fraud.go	78.04%	8 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #653      +/-   ##
==========================================
+ Coverage   29.86%   29.97%   +0.10%     
==========================================
  Files         220      221       +1     
  Lines       30812    30855      +43     
==========================================
+ Hits         9202     9248      +46     
+ Misses      20205    20195      -10     
- Partials     1405     1412       +7     

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[omritoptix]

imo cleaner to add it to the keeper_test (i.e on the test suite) as a public function.

[omritoptix]

here we'll revert fraud proof on first packet failure. possibly worth wrapping in applyFuncIfNoErr and continue to avoid one packet failing the reversion for all other. especially as the updateRollappPacketWithStatus triggers various hook so doesn't necessarily mean store error. wdyt

[mtsitrin]

thought about it quite long.
I just think that the alternative of keeping Pending packets of fraudulent rollapp may cause unexpected behaviour. maybe break invariant