Add labels instead of setting in github action (#5324)
Add labels instead of setting in github action (#5324)

Update `tag_module_cleanup.yml` logic to add labels instead of setting labels list.

Fixes: https://github.com/google/blockly/issues/5298
rachel-fenichel/blockly,rachel-fenichel/blockly,rachel-fenichel/blockly,rachel-fenichel/blockly,rachel-fenichel/blockly,mark-friedman/blockly,mark-friedman/blockly,google/blockly,google/blockly,google/blockly,google/blockly,mark-friedman/blockly,mark-friedman/blockly,mark-friedman/blockly,rachel-fenichel/blockly,rachel-fenichel/blockly,google/blockly,mark-friedman/blockly,google/blockly,google/blockly