fix: [DHIS2-21855] limit concurrent api requests

[JoakimSM]

Implements DHIS2-21855

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Key features

1. limit the number of concurrent api requests that can be made

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Description

https://dhis2.atlassian.net/browse/DHIS2-21855
dhis2/capture-app#4668

Making too many concurrent api requests can cause the browsers connection/resource pool to become exhausted (see: https://dhis2.atlassian.net/browse/DHIS2-21855?focusedCommentId=249571). Although the app (and its dependencies) should limit the number of requests it issues, I think it makes sense to enforce a global cap on concurrent requests as an additional safeguard (if the limit is reached, any additional API requests are queued and only sent once one or more of the in-flight requests have completed.)

Discussion points:

1. Should the limit be configurable in some way? Maybe having a hardcoded limit is okay for now..
2. If it isn't configurable, what hardcoded limit do we go with?

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Checklist

• Have written Documentation
  • Might depend on whether we make it configurable
• Has tests coverage

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

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

See analysis details on SonarQube Cloud