hive: Add --sim.exactmatch flag

[spencer-tb]

Description

Following this PR: #929

On occasion we may use a regex pattern that will run more tests than intended.

The intention behind the sim.limit below may be to solely run a single test in isolation:

... --sim.limit engine-cancun/"InvalidPayloadAttributes: Missing BeaconRoot" --docker.output

Due to the increasing number of tests within the engine simulator alongside its programtic naming of tests, the above sim.limit will run and additional test using regex matching:

InvalidPayloadAttributes: Missing BeaconRoot
InvalidPayloadAttributes: Missing BeaconRoot (Syncing)

Updated Proposed Change

Adds an additional boolean flag: --sim.exactmatch, that can be used to escape and anchor the regex expression specified within --sim.limit.