Merge pull request #8488 from cmpadden/remove-deprecations

Remove Deprecations (release-2021-01-28, 2021-06-01, 2021-10-28, 2021-11-18)

.changeset/many-trees-happen.md

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+---
+'@backstage/config-loader': minor
+---
+
+Removed deprecated option `env` from `LoadConfigOptions` and associated tests

.changeset/new-waves-rule.md

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+---
+'@backstage/core-app-api': minor
+---
+
+- Removed deprecated definition `createApp` from `@backstage/core-app-api` which has been replaced by `@backstage/app-defaults#createApp`
+- Removed deprecated type `BackstagePluginWithAnyOutput`
+- Removed deprecated constructors for `GithubAuth`, `OAuth2`, and `SamlAuth` as the `create` method should be used instead

.changeset/nice-apricots-grow.md

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+---
+'@backstage/core-plugin-api': minor
+---
+
+- Removed deprecated option `description` from `ApiRefConfig`
+- Removed descriptions from all plugin API refs
+- Removed deprecated parameters `path`, `icon`, and `title` in `createRouteRef`
+- Removed deprecated types `Error` and `ErrorContext` from `ErrorApi`

.changeset/olive-cameras-rush.md

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+---
+'@backstage/test-utils': minor
+---
+
+Removed deprecated `msw` definition which was replaced by calling `setupRequestMockHandlers` directly

.changeset/short-rockets-remain.md

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+---
+'@backstage/app-defaults': patch
+'@backstage/core-app-api': minor
+'@backstage/core-plugin-api': minor
+---
+
+- Removed deprecation configuration option `theme` from `AppTheme` of the `AppThemeApi`
+- Removed reference to `theme` in the `app-defaults` default `AppTheme`
+- Removed logic in `AppThemeProvider` that creates `ThemeProvider` from `appTheme.theme`