Match the whole label with grep

[lionseal]

Hello!

I added -w option to grep so it matches the whole label name.

We have other labels in our repos and it's matching the first character, ie:

• Our size labels are: XS,S,M,L,XL
• Other labels we have start with S,M,L, as in Simulation, Microservice, etc

When grep runs it matches Simulation, thus later removing it from the PR (which we don't want!)