Fix semaphore usage in don2don server req

[dhaidashenko]

Ensure that we lock the semaphore only once the capability execution is ready to occur.

Previously, multiple goroutines could acquire the semaphore lock and then wait for the same request to execute.
Thus, a single request occupied multiple semaphore slots for an extended period.

[github-actions]

I see you updated files related to core. Please run make gocs in the root directory to add a changeset as well as in the text include at least one of the following tags:

• #added For any new functionality added.
• #breaking_change For any functionality that requires manual action for the node to boot.
• #bugfix For bug fixes.
• #changed For any change to the existing functionality.
• #db_update For any feature that introduces updates to database schema.
• #deprecation_notice For any upcoming deprecation functionality.
• #internal For changesets that need to be excluded from the final changelog.
• #nops For any feature that is NOP facing and needs to be in the official Release Notes for the release.
• #removed For any functionality/config that is removed.
• #updated For any functionality that is updated.
• #wip For any change that is not ready yet and external communication about it should be held off till it is feature complete.

[github-actions]

✅ No conflicts with other open PRs targeting develop

[trunk-io]

     

Failed Test	Failure Summary	Logs
TestWriteReportExcludeSignaturesHasher_Hash_Stellar	The test named TestWriteReportExcludeSignaturesHasher_Hash_Stellar failed during execution.	Logs ↗︎
Test_RemoteExecutableCapability_ExecutionNotBlockedBySlowCapabilityExecution_AllAtOnce	The test failed without a specific error message, likely due to a timeout or missing expected behavior.	Logs ↗︎
TestTestMetadataRegistry_LocalNode_UsesConfiguredWorkflowDONF	The test failed during execution without providing specific error details.	Logs ↗︎
TestDonNotifier_WaitForDon	The test 'TestDonNotifier_WaitForDon' failed without providing specific error details.	Logs ↗︎

... and 3 more

View Full Report ↗︎ ⋅ Docs

[cl-sonarqube-production]

Quality Gate passed

Issues
1 New issue
1 Fixed issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube