Remove PII reaction due to performance issue

What does this MR do and why?

I have re-enabled CORS and PII reaction logic and run another round of profiling

Method: POST, Path: /v2/completions, Duration: 131.76418702100636, Status: 200

  _     ._   __/__   _ _  _  _ _/_   Recorded: 02:54:10  Samples:  135092
 /_//_/// /_\ / //_// / //_'/ //     Duration: 52.850    CPU time: 45.352
/   _/                      v4.4.0

Program: codesuggestions

48.677 MainThread  <thread>:274910217408
`- 48.664 <module>  <string>:1
   `- 48.664 main  codesuggestions/app.py:25
      `- 48.664 run  uvicorn/main.py:453
            [4422 frames hidden]  uvicorn, asyncio, starlette, fastapi,...
               44.161 AuthenticationMiddleware.__call__  starlette/middleware/authentication.py:29
               |  37.866 _patched  dependency_injector/wiring.py:992
               |  `- 37.847 completions  codesuggestions/api/v2/endpoints/suggestions.py:47
               |     `- 37.838 wrap  codesuggestions/api/timing.py:8
               |        `- 37.832 get_suggestions  codesuggestions/api/v2/endpoints/suggestions.py:66
               |           `- 37.831 CodeSuggestionsUseCaseV2.__call__  codesuggestions/suggestions/base.py:140
               |              |- 33.725 CodeSuggestionsUseCaseV2.redact_pii  codesuggestions/suggestions/base.py:93
               |              |  `- 33.717 CodeSuggestionsUseCaseV2._detect_pii  codesuggestions/suggestions/base.py:63
               |              |     |- 29.919 DetectorBasicAuthSecrets.detect_all  codesuggestions/suggestions/detectors.py:185
               |              |     |  `- 29.918 _run_detect_secrets_plugins  codesuggestions/suggestions/detectors.py:250
               |              |     |     |- 27.145 _process_line_based_plugins  detect_secrets/core/scan.py:305
               |              |     |     |     [6514 frames hidden]  detect_secrets, importlib, re, sre_co...
               |              |     |     |- 2.065 _GeneratorContextManager.__enter__  contextlib.py:114
               |              |     |     |     [200 frames hidden]  contextlib, detect_secrets, importlib...
               |              |     |     `- 0.698 _GeneratorContextManager.__exit__  contextlib.py:123
               |              |     |           [124 frames hidden]  contextlib, detect_secrets, copy, <bu...
               |              |     `- 3.738 DetectorTokenSecrets.detect_all  codesuggestions/suggestions/detectors.py:221
               |              |        `- 3.736 _run_detect_secrets_plugins  codesuggestions/suggestions/detectors.py:250
               |              |           |- 1.923 _GeneratorContextManager.__enter__  contextlib.py:114
               |              |           |     [118 frames hidden]  contextlib, detect_secrets, importlib...
               |              |           |- 1.090 _process_line_based_plugins  detect_secrets/core/scan.py:305
               |              |           |     [128 frames hidden]  detect_secrets, <built-in>, inspect, ...
               |              |           `- 0.715 _GeneratorContextManager.__exit__  contextlib.py:123
               |              |                 [124 frames hidden]  contextlib, detect_secrets, copy, <bu...
               |              `- 4.009 Codegen.__call__  codesuggestions/models/codegen.py:72
               |                 `- 3.674 InferenceServerClient.infer  tritonclient/grpc/__init__.py:1312
               |                       [116 frames hidden]  tritonclient, grpc, <built-in>, threa...
               `- 5.367 AuthBackend.authenticate  codesuggestions/api/middleware.py:136
                  `- 5.335 wrap  codesuggestions/api/timing.py:8
                     `- 5.331 AuthBackend.authenticate_with_token  codesuggestions/api/middleware.py:158
                        `- 5.324 GitLabAuthProvider.authenticate  codesuggestions/auth/providers.py:73
                           `- 4.938 GitLabAuthProvider._request_code_suggestions_allowed  codesuggestions/auth/providers.py:37
                              `- 4.826 get  requests/api.py:62
                                    [2868 frames hidden]  requests, urllib3, http, socket, <bui...
               3.785 CustomHeaderMiddleware.__call__  starlette/middleware/base.py:22
               `- 0.621 CustomHeaderMiddleware.dispatch  codesuggestions/api/middleware.py:54

Few observations:

• PII Reaction is taking most of the time
• CORS middleware does not affect the total time

Given the above, I propose we remove the PII Reaction but re-enable CORS to unblock the release of Web IDE with Code Suggestions release.