[feature] User muting (#2960)

* User muting

* Address review feedback

* Rename uniqueness constraint on user_mutes to match convention

* Remove unused account_id from where clause

* Add UserMute to NewTestDB

* Update test/envparsing.sh with new and fixed cache stuff

* Address tobi's review comments

* Make compiledUserMuteListEntry.expired consistent with UserMute.Expired

* Make sure mute_expires_at is serialized as an explicit null for indefinite mutes

---------

Co-authored-by: tobi <tobi.smethurst@protonmail.com>

internal/db/bundb/relationship.go

@@ -20,6 +20,7 @@ package bundb
 import (
 	"context"
 	"errors"
+	"time"
 
 	"github.com/superseriousbusiness/gotosocial/internal/db"
 	"github.com/superseriousbusiness/gotosocial/internal/gtscontext"
@@ -108,6 +109,16 @@ func (r *relationshipDB) GetRelationship(ctx context.Context, requestingAccount
 		rel.Note = note.Comment
 	}
 
+	// check if the requesting account is muting the target account
+	mute, err := r.GetMute(ctx, requestingAccount, targetAccount)
+	if err != nil && !errors.Is(err, db.ErrNoEntries) {
+		return nil, gtserror.Newf("error checking muting: %w", err)
+	}
+	if mute != nil && !mute.Expired(time.Now()) {
+		rel.Muting = true
+		rel.MutingNotifications = *mute.Notifications
+	}
+
 	return &rel, nil
 }