fix(fork): drs upgrade when multiple forks fix

[srene]

PR Standards

The objective of this PR is to fix detected issues in forking process:

• Stop condition modified to avoid stopping active proposers when submitting fork batch is wrong, rolled back to previous and added mutex.
• fork for deprecated drs for rollapps with multiple forks did not work because instruction file could have info from wrong fork (for previous height and not next height). its been fixed by getting always fork data from hub using current height.

Opening a pull request should be able to meet the following requirements

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PR naming convention: https://hackmd.io/@nZpxHZ0CT7O5ngTp0TP9mg/HJP_jrm7A

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Close #1268, #1267

<-- Briefly describe the content of this pull request -->

For Author:

• Targeted PR against correct branch
• included the correct type prefix in the PR title
• Linked to Github issue with discussion and accepted design
• Targets only one github issue
• Wrote unit and integration tests
• All CI checks have passed
• Added relevant godoc comments

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For Reviewer:

• confirmed the correct type prefix in the PR title
• Reviewers assigned
• confirmed all author checklist items have been addressed

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After reviewer approval:

• In case targets main branch, PR should be squashed and merged.
• In case PR targets a release branch, PR should be rebased.

[omritoptix]

redundant comment as it doesn't add anything on top of the function godoc.
we should strive to have more reasoning in our comments, not just explaining what we do (but why we do it).
needs to be updated because..