Bug 1858041 - [devtools] Replace fail-if with skip-if for 2 tests that inconsistently failing/passing a11y-checks. r=devtools-reviewers,nchevobbe

The two tests affected are now inconsistently passing (in opt builds on all trees) and failing the Tier 2 a11y-checks: `devtools/client/webconsole/test/browser/browser_webconsole_longstring_getter.js` and `devtools/client/inspector/rules/test/browser_rules_edit-property-computed.js`, thus we are replacing the `fail-if` expectations with `skip-if` while the investigation is ongoing.

Related bugs: bug 1849028, bug 1867062, bug 1868497

Differential Revision: https://phabricator.services.mozilla.com/D195468

Author: anna-yeddi

devtools/client/inspector/rules/test/browser_part1.toml

@@ -206,7 +206,7 @@ fail-if = ["a11y_checks"] # Bug 1849028 clicked element may not be focusable and
 ["browser_rules_edit-property-commit.js"]
 
 ["browser_rules_edit-property-computed.js"]
-fail-if = ["a11y_checks"] # Bug 1849028 clicked element may not be focusable and/or labeled
+skip-if = ["a11y_checks"] # Bugs 1849028 and 1858041 clicked span.ruleview-expander.theme-twisty is inconsistently not accessible
 
 ["browser_rules_edit-property-increments.js"]
 

devtools/client/webconsole/test/browser/_webconsole.toml

@@ -509,7 +509,7 @@ fail-if = ["a11y_checks"] # Bug 1849028 clicked element may not be focusable and
 fail-if = ["a11y_checks"] # Bug 1849028 clicked element may not be focusable and/or labeled
 
 ["browser_webconsole_longstring_getter.js"]
-fail-if = ["a11y_checks"] # Bug 1849028 clicked element may not be focusable and/or labeled
+skip-if = ["a11y_checks"] # Bugs 1849028 and 1858041 clicked BUTTON.arrow is inconsistently not focusable
 
 ["browser_webconsole_message_categories.js"]