Updated API Code Samples (#24141)

* api: remove PHP code samples

* api: remove Curl code samples

* api: remove Go code samples

* link out to marketplace exclusively for community-built drivers

* absolute path to V4_SRC

* programmatically extract x-codeSamples

* initial batch of examples

* Update api/server/main.go

Co-authored-by: Alejandro García Montoro <alejandro.garciamontoro@gmail.com>

* Update api/server/main.go

Co-authored-by: Alejandro García Montoro <alejandro.garciamontoro@gmail.com>

* Update api/server/main.go

Co-authored-by: Alejandro García Montoro <alejandro.garciamontoro@gmail.com>

* updated examples

---------

Co-authored-by: Alejandro García Montoro <alejandro.garciamontoro@gmail.com>

api/v4/source/imports.yaml

@@ -22,18 +22,3 @@
           $ref: "#/components/responses/Forbidden"
         "404":
           $ref: "#/components/responses/NotFound"
-      x-code-samples:
-        - lang: Go
-          source: >
-            import "github.com/mattermost/mattermost-server/v5/model"
-
-
-            Client := model.NewAPIv4Client("https://your-mattermost-url.com")
-
-            Client.Login("email@domain.com", "Password1")
-
-            imports, response := Client.ListImports()
-        - lang: Curl
-          source: |
-            curl 'http://localhost:8065/api/v4/imports' \
-            -H 'Authorization: Bearer 9kg8nqrnxprd9jbykqeg4r51hw'