feat: set default max concurrency to 100 for web-api client

[callumsteele4]

Summary

Fixes #1582

Sets the default maxRequestionConcurrency to 100 and updates relevant documentation and tests.

I've been unable to get the tests and linting running locally despite running npm i at root, npm run setup at root, and then npm run test at either root or in the specific package - so will be relying on GitHub actions to verify these pass.

Requirements (place an x in each [ ])

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
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[CLAassistant]

All committers have signed the CLA.

[mwbrooks]

Beauty @callumsteele4 🎉 🙇🏻 Thanks for following up with a pull request on #1582!

Your pull request looks good, so I've enabled the CI/CD tests to run on it.

@seratch I've assigned you as a reviewer, since you were talking with @callumsteele4 on the issue. I haven't chosen a semver or assigned it to a release milestone. I suspect this could be considered a patch, but I'll trust you to make that decision.

[seratch]

The doc and code changes look great to me! but the tests are failing. Could you resolve it?

[seratch]

@mwbrooks Thanks for checking this!

@seratch I've assigned you as a reviewer, since you were talking with @callumsteele4 on the issue. I haven't chosen a semver or assigned it to a release milestone. I suspect this could be considered a patch, but I'll trust you to make that decision.

I agree that we can include this in a patch version

[seratch]

LGTM