add changesets for core-plugin-api, test-utils, and config-loader

Signed-off-by: Colton Padden <colton.padden@fastmail.com>

.changeset/many-trees-happen.md

@@ -0,0 +1,5 @@
+---
+'@backstage/config-loader': patch
+---
+
+Removed deprecated option `env` from `LoadConfigOptions` and associated tests

.changeset/nice-apricots-grow.md

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

.changeset/olive-cameras-rush.md

@@ -0,0 +1,5 @@
+---
+'@backstage/test-utils': patch
+---
+
+Removed deprecated `msw` definition which was replaced by calling `setupRequestMockHandlers` directly