Add changeset types to existing changesets

In the latest mono version support for changeset types were added. Newer
mono versions won't publish package changesets without types. Add these
types for existing changesets so they can be published with the latest
mono version.

[skip changeset]
[skip ci]

.changesets/add-fish-shell-support.md

@@ -1,5 +1,6 @@
 ---
 bump: "minor"
+type: "add"
 ---
 
 Add support for the `fish` shell in the `script/setup` installation script.

.changesets/fix-changeset-package-index-validation.md

@@ -1,5 +1,6 @@
 ---
 bump: "patch"
+type: "fix"
 ---
 
 Validate user input of the package number for changesets in mono repositories better. Non number characters and other invalid strings will prompt the user again to enter a valid package number.

.changesets/print-changeset-summaries-on-publish.md

@@ -1,5 +1,6 @@
 ---
 bump: "patch"
+type: "add"
 ---
 
 Print changeset summaries on publish. This makes it easier to tell which changes are about to be published for every package.

.changesets/print-changeset-type-on-publish-preview.md

@@ -1,6 +1,6 @@
 ---
 bump: "patch"
-type: "change"
+type: "add"
 ---
 
 Print changeset type on publish preview.