Support new robot 7.4 secret variables as part of auth params

[oboehmer]

resolves #410

Overview

This branch adds support for Robot Framework's Secret type (introduced in Robot Framework 7.4) to prevent credential exposure in logs, even at DEBUG and TRACE levels.

Key Features

1. Robot Framework Secret Type Support

Automatically detects and processes Robot Framework's Secret type in authentication credentials. Secrets are extracted from wrappers before passing to requests library and never logged in clear text.

2. Conditional Authorization Header Masking

• With Secrets: Authorization headers masked (Authorization: *****) in HTTP debug output
• Without Secrets: Headers remain visible for debugging
• INFO Level: Always masks (existing behavior preserved)

3. Backward Compatibility

Fully compatible with Robot Framework < 7.4. Gracefully degrades when Secret type unavailable. No breaking changes.

Core Changes

• utils.py: Added check_and_process_secrets() for single-pass secret detection and processing (optimized from O(2n) to O(n))
• RequestsKeywords.py: Tracks secret usage via _request_has_secrets flag, processes auth parameters
• SessionKeywords.py: Regex-based masking in _print_debug(), stores _has_secrets on session objects
• log.py: Enhanced log_request() to conditionally mask based on secret presence

Session Support

All session creation keywords updated to detect and track secrets:

• Create Session
• Create Client Cert Session
• Create Digest Session
• Create Ntlm Session

Testing

• 3 new test cases for Robot Secrets (Basic auth, Digest auth, session-less)
• Unit tests for secret processing functions
• CI/CD matrix tests RF 7.3.2 and 7.4

[codecov]

Codecov Report

❌ Patch coverage is 88.23529% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.97%. Comparing base (3f83f5d) to head (4d726b0).

Files with missing lines	Patch %	Lines
src/RequestsLibrary/SessionKeywords.py	75.00%	7 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #411      +/-   ##
==========================================
+ Coverage   85.38%   88.97%   +3.58%     
==========================================
  Files           9        9              
  Lines         479      535      +56     
  Branches       49       61      +12     
==========================================
+ Hits          409      476      +67     
+ Misses         65       56       -9     
+ Partials        5        3       -2     

Flag	Coverage Δ
acceptance	84.11% <75.00%> (-1.28%)	⬇️
unit	63.92% <80.88%> (?)

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[oboehmer]

@lucagiove . Can you please review this PR? Would be great to have this available once rf7.4 is released