🚧Add file exist checking to repo client

[CalvinWilkinson]

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• I have updated the title without removing the 🚧 emoji.

Description

Add the ability to check if a repository file exists before getting or updating the file in the RepoClient. This check can then be used to throw a proper error that the file does not exist before getting the file or updating the file.

Currently, when using the getFileContent() or updateFile() functions, if the file does not exist, then an error is thrown but with no information as to why. Performing a file check first will give the ability to throw an error correctly to notify the user why the fail occurred.

Use the existing fileExists() function to check for the file first.

Acceptance Criteria

The items to complete to satisfy the Definition of Done.

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1. All the unit tests have been executed and passed locally after the PR work is complete. (Why? Refer to 'Additional Information' below.)
2. The RepoClient has been improved with file exist checking

ToDo Items

The items to complete to satisfy the Definition of Done.

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1. Add a change type label to the issue. Refer to the Change Type Labels section below.
2. Add a priority label to the issue. Refer to the Priority Type Labels section below.
3. Link the issue to the correct milestone (if applicable).

Issue Dependencies

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Related Work

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Additional Information:

Unit Tests

Reasons for local unit test execution:

• Unit tests might pass locally but not in the CI environment during the status check process or vice-versa.
• Tests might pass on the developer's machine but not necessarily on the code reviewer's machine.
• If you notice that the test status check has passed but the test failed locally, please notify a project maintainer!

💡Warning💡
If the unit tests pass remotely and are not executed locally, this means we could be letting a bug slip into production.
Though bugs will always exist in some capacity, we should all do our part to help prevent them from happening.

Change Type Labels

Change Type	Label
Bug Fixes	🐛bug
Breaking Changes	🧨breaking-changes
New Feature	✨new-feature
CICD Changes	♻️cicd
Config Changes	⚙️config
Performance Improvements	🏎️performance
Code Doc Changes	🗒️documentation/code
Product Doc Changes	📝documentation/product

Priority Type Labels

Priority Type	Label
Low Priority	low priority
Medium Priority	medium priority
High Priority	high priority

Code of Conduct

• I agree to follow this project's Code of Conduct.