Fix list branch query

[kuzminT]

Refers to #312.

• Fixed incorrect handling of the q (query) parameter in the ListBranches method.
• Added unit tests and documentation for ListBranches.
• Automatic pagination via executePaginated is not yet implemented. Supporting it requires refactoring the decodeRepositoryBranches method to use a different format. I can include these changes in this PR if that’s fine.

[gemini-code-assist]

Summary of Changes

Hello @kuzminT, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses an issue with the ListBranches method by correctly implementing the q (query) parameter for filtering branches. It also enhances the codebase with new unit tests for this functionality and updates documentation. The author has noted that automatic pagination is not yet included but could be integrated in a follow-up.

Highlights

• Branch Listing Query Fix: The ListBranches method in repository.go now correctly formats the q parameter for filtering branches, using the Bitbucket API's name ~ "query" syntax instead of a simple string match.
• Unit Test Addition: A new unit test, TestListBranches, has been added to tests/repository_test.go to ensure the proper functioning of the ListBranches method, including its query capabilities.
• Dependency Modernization: The ioutil.ReadAll function has been replaced with io.ReadAll in repository.go, aligning with modern Go practices for reading from io.Reader interfaces.
• Gitignore Update: The .gitignore file was updated to exclude .idea and .env directories, preventing common development environment files from being tracked by Git.

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[gemini-code-assist]

Code Review

This pull request fixes an issue with the q (query) parameter in the ListBranches method, adds documentation, and a new unit test. The change correctly formats the query for the Bitbucket API. However, there's a potential issue with URL encoding of the ~ operator which I've highlighted. The new test is a good start, but I've suggested improvements to make it more robust. The update from ioutil to io is a good practice.