ignorePatterns glob is no longer relative to the project root

[DetachHead]

this seems to be a regression caused by #220

the ignorePatterns used to work relative to the root of the project, but this no longer seems to be the case. for example when ignoring the file foo.py in the project root, the pattern foo.py used to work, but now i have to use **/foo.py because it appears to now be matching against the full path instead.

Diagnostic Data

• Python version (& distribution if applicable, e.g., Anaconda): 3.13.1
• Type of virtual environment used (e.g., conda, venv, virtualenv, etc.): uv
• Operating system (and version): windows 11
• Version of tool extension you are using: 2024.0.0

Behaviour

Expected Behavior

file is ignored

Actual Behavior

file is not ignored

Reproduction Steps:

specify a file that's located in the project root to be ignored, eg:

{
    "mypy-type-checker.ignorePatterns": ["foo.py"]
}

# ./foo.py
foo: int = ""

Logs:

Click here for detailed logs

2025-01-09 11:12:32.073 [info] c:\Users\user\project\.venv\Scripts\python.exe -m mypy --no-color-output --no-error-summary --show-absolute-path --show-column-numbers --show-error-codes --no-pretty --ide --hide-error-code-links --show-error-end c:\Users\user\project\foo.py
2025-01-09 11:12:32.073 [info] [Trace - 11:12:32 AM] Received notification 'window/logMessage'.
2025-01-09 11:12:32.073 [info] CWD Server: c:\Users\user\project
2025-01-09 11:12:34.796 [info] [Trace - 11:12:34 AM] Received notification 'window/logMessage'.
2025-01-09 11:12:34.797 [info] file:///c%3A/Users/user/project/foo.py :
c:\Users\user\project\foo.py:1:12:1:13: error: Incompatible types in assignment (expression has type "str", variable has type "int")  [assignment]

2025-01-09 11:12:34.797 [info] [Trace - 11:12:34 AM] Received notification 'window/logMessage'.
2025-01-09 11:12:34.797 [info] file:///c%3A/Users/user/project/foo.py :
c:\Users\user\project\foo.py:1:12:1:13: error: Incompatible types in assignment (expression has type "str", variable has type "int")  [assignment]

2025-01-09 11:12:34.797 [info] [Trace - 11:12:34 AM] Received notification 'textDocument/publishDiagnostics'.