docs(junit): document existing options and env (#30595)

Author: yury-s

docs/src/test-reporters-js.md

@@ -263,6 +263,12 @@ export default defineConfig({
 });
 ```
 
+JSON report supports following configuration options and environment variables:
+
+| Environment Variable Name | Reporter Config Option| Description | Default
+|---|---|---|---|
+| `PLAYWRIGHT_JUNIT_OUTPUT_NAME` | `outputFile` | Report file path. | JSON report is printed to stdout.
+
 ### JUnit reporter
 
 JUnit reporter produces a JUnit-style xml report.
@@ -293,6 +299,16 @@ export default defineConfig({
 });
 ```
 
+JUnit report supports following configuration options and environment variables:
+
+| Environment Variable Name | Reporter Config Option| Description | Default
+|---|---|---|---|
+| `PLAYWRIGHT_JUNIT_OUTPUT_NAME` | `outputFile` | Report file path. | JUnit report is printed to stdout.
+|  | `stripANSIControlSequences` | Whether to remove ANSI control sequences from the text before writing it in the report. | By default output text is added as is.
+|  | `includeProjectInTestName` | Whether to include Playwright project name in every test case as a name prefix. | By default not included.
+| `PLAYWRIGHT_JUNIT_SUITE_ID` |  | Value of the `id` attribute on the root `<testsuites/>` report entry. | Empty string.
+| `PLAYWRIGHT_JUNIT_SUITE_NAME` |  | Value of the `name` attribute on the root `<testsuites/>` report entry. | Empty string.
+
 ### GitHub Actions annotations
 
 You can use the built in `github` reporter to get automatic failure annotations when running in GitHub actions.