Enable view=test mode in wpt.fyi (#190)

* Enable view=test mode in wpt.fyi

* Update wptfyi_enable_view_eq_test.md

* Update rfcs/wptfyi_enable_view_eq_test.md

Co-authored-by: jgraham <[email protected]>

---------

Co-authored-by: jgraham <[email protected]>

Author: jcscottiii

rfcs/wptfyi_enable_view_eq_test.md

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+## RFC 190: Enable view=test mode in wpt.fyi
+
+## Summary
+This RFC proposes enabling a new "test" view mode. This mode introduces a new method for counting total and failing tests, focusing on a strict pass/fail metric based on subtest counts. It includes frontend modifications to facilitate this change. This is to support this [feature request](https://github.com/web-platform-tests/wpt.fyi/issues/3740).
+
+## Details
+
+### Key Changes
+Currently, the feature is behind a feature flag that is set to false by default in production.
+* **Frontend Changes:**
+No frontend changes. This is will only be reachable by a query parameter that the end user must construct.
+
+### Background about "test" View Mode Behavior
+* Test pass is only registered when the number of passed subtests equals the total number of subtests.
+* Percentages are not displayed, only raw counts at the directory level.
+* Individual test level display:
+    - Shows "PASS" only when subtest passes equal total subtests.
+    - Shows "FAIL" when `status == OK` but subtest passes do not equal total subtests.
+    - Existing `STATUS_ABBREVIATIONS` mappings used for other statuses.
+    - "FAIL" as a fallback for any unmapped statuses.
+
+### How To Test The Change
+
+The feature has been enabled in staging by default so users can try it out.
+
+- Go to any page on https://staging.wpt.fyi that shows test counts
+- Add the view=test query parameter to the URL
+
+Examples:
+- https://staging.wpt.fyi/results/?label=experimental&label=master&aligned&view=test
+- https://staging.wpt.fyi/results/compat?label=experimental&label=master&aligned&view=test
+- https://staging.wpt.fyi/results/webstorage?label=experimental&label=master&aligned&view=test
+
+
+### Risks
+
+1. This new approach has different strengths and weaknesses to the long-standing default subtest view on wpt.fyi.
+    - Mitigation: The default will remain unchanged to support current workflows and existing links.