docs: add changeset files

Signed-off-by: Camila Belo <camilaibs@gmail.com>

.changeset/fluffy-donuts-end.md

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+---
+'@backstage/plugin-scaffolder-backend': minor
+---
+
+Migrate plugin to use the new auth services.
+**BREAKING**: Add a required service discovery to the router options and remove the optional identity from it. Also change the permissions type to be `PermissionsService`.

.changeset/fresh-parrots-learn.md

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+---
+'@backstage/plugin-scaffolder-node': patch
+---
+
+Update task secrets and context types to contain the new auth initiator credentials.

.changeset/shaggy-pears-dream.md

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+---
+'@backstage/create-app': patch
+---
+
+Update scaffolder template to pass the discovery service to the create router and remove the identity option.

.changeset/sixty-balloons-lie.md

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+---
+'@backstage/plugin-scaffolder-node-test-utils': patch
+---
+
+Add an initiator credentials getter to the default mocked context.