Lint for event filter and deprecate exclude (#3222)

Closes https://github.com/woodpecker-ci/woodpecker/discussions/2174

- return bad habit error if no event filter is set
- If this is applied, it's useless to allow `exclude`s on events.
Therefore, deprecate it together with `include`s which should be
replaced by `base.StringOrSlice` later.

cmd/server/docs/docs.go

@@ -4423,9 +4423,11 @@ const docTemplate = `{
                 "linter",
                 "deprecation",
                 "compiler",
-                "generic"
+                "generic",
+                "bad_habit"
             ],
             "x-enum-comments": {
+                "PipelineErrorTypeBadHabit": "some bad-habit error",
                 "PipelineErrorTypeCompiler": "some error with the config semantics",
                 "PipelineErrorTypeDeprecation": "using some deprecated feature",
                 "PipelineErrorTypeGeneric": "some generic error",
@@ -4435,7 +4437,8 @@ const docTemplate = `{
                 "PipelineErrorTypeLinter",
                 "PipelineErrorTypeDeprecation",
                 "PipelineErrorTypeCompiler",
-                "PipelineErrorTypeGeneric"
+                "PipelineErrorTypeGeneric",
+                "PipelineErrorTypeBadHabit"
             ]
         },
         "model.Workflow": {