docs: add changeset files

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

.changeset/fifty-cameras-shake.md

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+---
+'@backstage/plugin-auth-node': patch
+---
+
+Update the default cookie base path, create a experimental redirect to root and app mode components to be used when the public entry is enabled.

.changeset/forty-elephants-count.md

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+---
+'@backstage/plugin-techdocs-backend': patch
+---
+
+Use the default cookie endpoints added automatically when a cookie policy is set.

.changeset/large-hotels-accept.md

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+---
+'@backstage/plugin-auth-node': patch
+---
+
+Add a auth cookie middleware factory.

.changeset/smooth-squids-design.md

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+---
+'@backstage/plugin-app-backend': patch
+---
+
+Track assets namespace in the cache store, implement a cookie authentication for when the public entry is enabled and used with new auth services.