Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/boards/swagger/README.md

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+# Swagger / OpenAPI 2.0 auto-generated files
+
+⚠️ **Warning:** The API is currently considered Beta and major changes are planned. Please [see this note](https://github.com/mattermost/focalboard/discussions/2139) for more details.
+
+This folder is generated by the `make swagger` command from comments in the server code.
+
+Prerequisites:
+1. [go-swagger](https://goswagger.io/install.html)
+2. [openapi-generator](https://github.com/OpenAPITools/openapi-generator)
+
+These can be installed via Homebrew:
+```
+brew tap go-swagger/go-swagger
+brew install go-swagger
+brew install openapi-generator
+```
+
+# Server API documentation
+
+See the generated [server API documentation here](https://htmlpreview.github.io/?https://github.com/mattermost/focalboard/blob/main/server/swagger/docs/html/index.html).
+
+# How to authenticate
+
+To auth against Personal Server, first call login with your credentials to get a token, e.g.
+```
+curl -X POST \
+ -H "Accept: application/json" \
+ -H "X-Requested-With: XMLHttpRequest" \
+ -H "Content-Type: application/json" \
+ "http://localhost:8000/api/v2/login" \
+ -d '{
+  "type" : "normal",
+  "username" : "testuser",
+  "password" : "testpass"
+}'
+```
+
+This should return a token in the form:
+```
+{"token":"abcdefghijklmnopqrstuvwxyz1"}
+```
+
+Pass this as the bearer auth to subsequent calls, e.g.
+```
+curl -X GET \
+ -H "Accept: application/json" \
+ -H "Authorization: Bearer abcdefghijklmnopqrstuvwxyz1" \
+ -H "X-Requested-With: XMLHttpRequest" \
+ -H "Content-Type: application/json" \
+ "http://localhost:8000/api/v2/teams/0/boards"
+```
+
+# Differences for Mattermost Boards
+
+The auto-generated Swagger API documentation is for Focalboard Personal Server. If you are calling the API on Mattermost Boards, the additional changes are:
+
+### API URLs endpoint
+
+The API endpoint is at `https://SERVERNAME/plugins/focalboard/api/`, e.g. `https://community.mattermost.com/plugins/focalboard/api/`.
+
+### Use the Mattermost auth token
+
+Refer to the [Mattermost API documentation here](https://api.mattermost.com/#tag/authentication) on how to obtain the auth token.
+
+Pass this token as a bearer token to the Boards APIs, e.g.
+
+```
+curl -i -H "X-Requested-With: XMLHttpRequest" -H 'Authorization: Bearer abcdefghijklmnopqrstuvwxyz' https://community.mattermost.com/plugins/focalboard/api/v2/workspaces
+```
+
+Note that the `X-Requested-With: XMLHttpRequest` header is required to pass the CSRF check.
+
+# We want to hear from you!
+
+If you are planning on using the Boards API, we would love to hear about what you'd like to do, and how we can improve the APIs in the future. [See here](https://github.com/mattermost/focalboard/discussions/2139) for more details on how to connect.

server/boards/swagger/docs/html/.openapi-generator-ignore

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+# OpenAPI Generator Ignore
+# Generated by openapi-generator https://github.com/openapitools/openapi-generator
+
+# Use this file to prevent files from being overwritten by the generator.
+# The patterns follow closely to .gitignore or .dockerignore.
+
+# As an example, the C# client generator defines ApiClient.cs.
+# You can make changes and tell OpenAPI Generator to ignore just this file by uncommenting the following line:
+#ApiClient.cs
+
+# You can match any string of characters against a directory, file or extension with a single asterisk (*):
+#foo/*/qux
+# The above matches foo/bar/qux and foo/baz/qux, but not foo/bar/baz/qux
+
+# You can recursively match patterns against a directory, file or extension with a double asterisk (**):
+#foo/**/qux
+# This matches foo/bar/qux, foo/baz/qux, and foo/bar/baz/qux
+
+# You can also negate patterns with an exclamation (!).
+# For example, you can ignore all files in a docs folder with the file extension .md:
+#docs/*.md
+# Then explicitly reverse the ignore rule for a single file:
+#!docs/README.md

server/boards/swagger/docs/html/.openapi-generator/VERSION

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+6.2.1