Feat: Improve hostname validator

[Meldiron]

Problems with previous solution:

• Too complex

• Allowed multiple wildcards like *.*.gitpod.io which is not allowed by standard

• Wildcard only allowed one level of subdomain, not all of them

• Wildcard was allowed in middle of domain like api.*.com and myapp.*. Again, not part of standard

• New logic implemented

• Tests updated

[christyjacob4]

Looks good 👌