FaultInjection: Refactors applyPercentage name to injectionRate to make feature clearer.

[NaluTripician]

Pull Request Template

Description

Changed the name of the ApplyPercentage feature to InjectionRate. This should make the function of the feature clearer to users. This will also be the name of the feature in the Java SDK.

Type of change

Please delete options that are not relevant.

• [] Bug fix (non-breaking change which fixes an issue)
• [] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [] This change requires a documentation update

Closing issues

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[NaluTripician]

LGTM. Let's verify why the tests are failing.

Looks like they are from some flaky tests. They seem to be failing on other PRs too and I have seen these randomly fail before. I will rerun the test a few more time to double check but currently there are no tests that rely on this.