admin: accept a list of collections in the task collection filter (#10953)

The collection filter was parsed twice with two syntaxes: the master-side
volume listing compiled the whole string as one regex, while EC encode and
EC balance detection split it on commas and matched each entry as a
wildcard. A volume had to pass both, so "collection-a,collection-b" matched
nothing (no collection is named that), and the ALL_COLLECTIONS sentinel,
which the master side skips, dropped every volume at the task side.

Parse it once, in one place: a comma-separated list where an entry is a
name with optional * and ? wildcards, or a regex when it carries regex
syntax. A regex entry now has to match the whole name unless it anchors
itself, so listing a collection no longer picks up its longer namesakes.

weed/worker/tasks/vacuum/plugin_handler.go

@@ -85,7 +85,7 @@ func (h *VacuumHandler) Descriptor() *plugin_pb.JobTypeDescriptor {
 						{
 							Name:        "collection_filter",
 							Label:       "Collection Filter",
-							Description: "Filter collections for vacuum detection. Use ALL_COLLECTIONS (default) to treat all volumes as one pool, EACH_COLLECTION to run detection separately per collection, or a regex pattern to match specific collections.",
+							Description: "Filter collections for vacuum detection. Use ALL_COLLECTIONS (default) to treat all volumes as one pool, EACH_COLLECTION to run detection separately per collection, or a comma-separated list of names, wildcards, or regex patterns.",
 							Placeholder: "ALL_COLLECTIONS",
 							FieldType:   plugin_pb.ConfigFieldType_CONFIG_FIELD_TYPE_STRING,
 							Widget:      plugin_pb.ConfigWidget_CONFIG_WIDGET_TEXT,