Merge pull request #20456 from backstage/camilal/migrate-stackoverflow-to-declarative-integration

[DI] Migrate `Stack Overflow` plugins to declarative integration

.changeset/chilly-terms-behave.md

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+---
+'@backstage/plugin-search-backend-module-stack-overflow-collator': minor
+---
+
+Extract a package for the Stack Overflow new backend system plugin.

.changeset/flat-ducks-buy.md

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+---
+'@backstage/plugin-search-backend-node': patch
+---
+
+Fix highlighting for non-string fields on the `Lunr` search engine implementation.

.changeset/giant-cycles-end.md

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+---
+'@backstage/plugin-stack-overflow-backend': patch
+---
+
+Deprecate package in favor of the new `@backstage/plugin-search-backend-module-stack-overflow-collator` module.
+
+The search collator `requestParams` option is optional now, so its default value is `{ order: 'desc', sort: 'activity', site: 'stackoverflow' }` as defined in the `Try It` section on the [official Stack Overflow API documentation](https://api.stackexchange.com/docs/questions).

.changeset/nice-pillows-poke.md

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+---
+'@backstage/plugin-stack-overflow': patch
+---
+
+Migrate package to the new Frontend system, the new module is distributed with a `/alpha` subpath.