build: update logging statements to make json log work - fixes #6038

This changes log statements from log to fs package, which is required for --use-json-log
to properly make log output in JSON format. The recently added custom linting rule,
handled by ruleguard via gocritic via golangci-lint, warns about these and suggests
the alternative. Fixing was therefore basically running "golangci-lint run --fix",
although some manual fixup of mainly imports are necessary following that.

fs/operations/dedupe.go

@@ -5,7 +5,6 @@ package operations
 import (
 	"context"
 	"fmt"
-	"log"
 	"path"
 	"sort"
 	"strings"
@@ -21,7 +20,7 @@ import (
 func dedupeRename(ctx context.Context, f fs.Fs, remote string, objs []fs.Object) {
 	doMove := f.Features().Move
 	if doMove == nil {
-		log.Fatalf("Fs %v doesn't support Move", f)
+		fs.Fatalf(nil, "Fs %v doesn't support Move", f)
 	}
 	ext := path.Ext(remote)
 	base := remote[:len(remote)-len(ext)]