MOB-38657: Add unhandledPromptBehavior: ignore capability across all browser options

[ssudame2]

Root Cause:

• unhandledPromptBehavior: ignore was inconsistently applied — only Chrome had it in its options method (_get_chrome_options); Firefox had it buried in profile methods only.
• Edge, WebKitGTK (Safari/MiniBrowser), and the ArgOptions fallback (triggered when no explicit browser: is set in YAML and browser is chosen externally, e.g. via BlazeMeter UI) had no unhandledPromptBehavior set at all The ArgOptions path is the most impactful gap — any remote cloud run without an explicit browser: in YAML silently skipped this capability.

Fix:

• Added options.set_capability('unhandledPromptBehavior', 'ignore') to all browser options methods in generator.py:
  • _get_firefox_options() — was missing; only existed in profile methods
  • _get_edge_options() — was entirely absent
  • _get_webkitgtk_options() — was entirely absent
  • ArgOptions fallback in _get_options() — was entirely absent; this covers remote runs where browser is selected outside of taurus YAML (e.g. BlazeMeter cloud UI)
• Chrome (_get_chrome_options) was already correct — no change

Test Cases Covered:

• Chrome (local) — capability already present via _get_chrome_options; unchanged
• Firefox (local) — capability now set at options level, consistent with Chrome
• Edge (local, Selenium 4+) — capability now set via _get_edge_options
• Safari/MiniBrowser (remote BlazeMeter grid) — capability now set via _get_webkitgtk_options

Remote run with no explicit browser in YAML (e.g. BlazeMeter cloud) — capability now set via ArgOptions fallback; this was the primary reported failure case (test_requests.py showed ArgOptions() with no unhandledPromptBehavior)

Each PR must conform to Developer's Guide.

Quick checklist:

• Description of PR explains the context of change
• Unit tests cover the change, no broken tests
• No static analysis warnings (Codacy etc.)
• Documentation update ('available in the unstable snapshot' warning if necessary)
• Changes file inside site/dat/docs/changes directory, one-line note of change inside

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.85%. Comparing base (ea643e4) to head (dbc42b5).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1976      +/-   ##
==========================================
- Coverage   89.91%   89.85%   -0.06%     
==========================================
  Files          71       71              
  Lines       20182    20182              
==========================================
- Hits        18145    18132      -13     
- Misses       2037     2050      +13     

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