react-native-onyx Fix `getCollectionKey()` and `splitCollectionMemberKey()` logic to consider more possibilities of keys / collection keys

Details

This PR:

Fixes both getCollectionKey() and splitCollectionMemberKey() logic to consider some keys / collection keys edge cases with underscore that weren't being considered before e.g. report__FAKE and cards_-1_Expensify Card, thus fixing https://github.com/Expensify/App/issues/48777 and https://github.com/Expensify/App/issues/49147.
Fixes canEvict tests in useOnyxTest.ts as they were actually wrong and were only working because of the faulty logic this PR is fixing.

Related Issues

https://github.com/Expensify/App/issues/48777

https://github.com/Expensify/App/issues/49147

Automated Tests

Manual Tests

Author Checklist

[x] I linked the correct issue in the ### Related Issues section above
[x] I wrote clear testing steps that cover the changes made in this PR
- [x] I added steps for local testing in the Tests section
- [x] I tested this PR with a High Traffic account against the staging or production API to ensure there are no regressions (e.g. long loading states that impact usability).
[x] I included screenshots or videos for tests on all platforms
[x] I ran the tests on all platforms & verified they passed on:
- [x] Android / native
- [x] Android / Chrome
- [x] iOS / native
- [x] iOS / Safari
- [x] MacOS / Chrome / Safari
- [x] MacOS / Desktop
[x] I verified there are no console errors (if there's a console error not related to the PR, report it or open an issue for it to be fixed)
[x] I followed proper code patterns (see Reviewing the code)
- [x] I verified that any callback methods that were added or modified are named for what the method does and never what callback they handle (i.e. toggleReport and not onIconClick)
- [x] I verified that the left part of a conditional rendering a React component is a boolean and NOT a string, e.g. myBool && <MyComponent />.
- [x] I verified that comments were added to code that is not self explanatory
- [x] I verified that any new or modified comments were clear, correct English, and explained "why" the code was doing something instead of only explaining "what" the code was doing.
- [x] I verified proper file naming conventions were followed for any new files or renamed files. All non-platform specific files are named after what they export and are not named "index.js". All platform-specific files are named for the platform the code supports as outlined in the README.
- [x] I verified the JSDocs style guidelines (in STYLE.md) were followed
[x] If a new code pattern is added I verified it was agreed to be used by multiple Expensify engineers
[x] I followed the guidelines as stated in the Review Guidelines
[x] I tested other components that can be impacted by my changes (i.e. if the PR modifies a shared library or component like Avatar, I verified the components using Avatar are working as expected)
[x] I verified all code is DRY (the PR doesn't include any logic written more than once, with the exception of tests)
[x] I verified any variables that can be defined as constants (ie. in CONST.js or at the top of the file that uses the constant) are defined as such
[x] I verified that if a function's arguments changed that all usages have also been updated correctly
[x] If a new component is created I verified that:
- [x] A similar component doesn't exist in the codebase
- [x] All props are defined accurately and each prop has a /** comment above it */
- [x] The file is named correctly
- [x] The component has a clear name that is non-ambiguous and the purpose of the component can be inferred from the name alone
- [x] The only data being stored in the state is data necessary for rendering and nothing else
- [x] If we are not using the full Onyx data that we loaded, I've added the proper selector in order to ensure the component only re-renders when the data it is using changes
- [x] For Class Components, any internal methods passed to components event handlers are bound to this properly so there are no scoping issues (i.e. for onClick={this.submit} the method this.submit should be bound to this in the constructor)
- [x] Any internal methods bound to this are necessary to be bound (i.e. avoid this.submit = this.submit.bind(this); if this.submit is never passed to a component event handler like onClick)
- [x] All JSX used for rendering exists in the render method
- [x] The component has the minimum amount of code necessary for its purpose, and it is broken down into smaller components in order to separate concerns and functions
[x] If any new file was added I verified that:
- [x] The file has a description of what it does and/or why is needed at the top of the file if the code is not self explanatory
[x] If the PR modifies a generic component, I tested and verified that those changes do not break usages of that component in the rest of the App (i.e. if a shared library or component like Avatar is modified, I verified that Avatar is working as expected in all cases)
[x] If the main branch was merged into this PR after a review, I tested again and verified the outcome was still expected according to the Test steps.
[x] I have checked off every checkbox in the PR author checklist, including those that don't apply to this PR.