[jest-each] Template table heading validation and extraction (#8766)

Co-authored-by: Tim Seckinger <[email protected]>

Author: mattphillips

CHANGELOG.md

@@ -23,6 +23,7 @@
 - `[jest-circus]` Fixed the issue of beforeAll & afterAll hooks getting executed even if it is inside a skipped `describe` block [#10451](https://github.com/facebook/jest/issues/10451)
 - `[jest-circus]` Fix `testLocation` on Windows when using `test.each` ([#10871](https://github.com/facebook/jest/pull/10871))
 - `[jest-console]` `console.dir` now respects the second argument correctly ([#10638](https://github.com/facebook/jest/pull/10638))
+- `[jest-each]` [**BREAKING**] Ignore excess words in headings ([#8766](https://github.com/facebook/jest/pull/8766))
 - `[jest-environment-jsdom]` Use inner realm’s `ArrayBuffer` constructor ([#10885](https://github.com/facebook/jest/pull/10885))
 - `[jest-globals]` [**BREAKING**] Disallow return values other than a `Promise` from hooks and tests ([#10512](https://github.com/facebook/jest/pull/10512))
 - `[jest-globals]` [**BREAKING**] Disallow mixing a done callback and returning a `Promise` from hooks and tests ([#10512](https://github.com/facebook/jest/pull/10512))