[Bug][Resolver]: Multiline comments crashing resolver

[malhotra5]

End-user friendly description of the problem this fixes or functionality that this introduces

• Include this change in the Release Notes. If checked, you must provide an end-user friendly description for your change below

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Give a summary of what the PR does, explaining any non-trivial design decisions

Summary

There is a bug where comments with quotations or multi-line comments caused the resolver to crash. This is because we were using bash to check the event body for "openhands-agent` macro, but the event body string was not properly escaped.

In this PR, we've opted to move away from bash and use javascript instead to implement the same functionality.

Alternatives considered but opted against

1. Properly escape the string in bash (if [[ "$(echo '${{ github.event.comment.body }}' | tr -d '\n' | sed "s/'/'\\\\''/g")" == "@openhands-agent-exp"* ]]; then)
   a. Opted against this as readability becomes tough and the expression needs to be used in multiple places
2. Set the comment body as an ENV var in a previous step, then reference it in the conditional
   a. Opted against this as it would bloat the workflow with too many steps

Sample Test

Example workflow logs

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Link of any specific issues this addresses
#5230

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To run this PR locally, use the following command:

docker run -it --rm   -p 3000:3000   -v /var/run/docker.sock:/var/run/docker.sock   --add-host host.docker.internal:host-gateway   -e SANDBOX_RUNTIME_CONTAINER_IMAGE=docker.all-hands.dev/all-hands-ai/runtime:dcb6858-nikolaik   --name openhands-app-dcb6858   docker.all-hands.dev/all-hands-ai/openhands:dcb6858

[enyst]

Oh, very significant difference in readability, thanks!