Add the ability to exclude selectors from scanner

[abdulahmad307]

There may be situations where there are embedded iframes, 3rd party, or user generated content that should not be scanned. AxeBuilder has the ability to exclude selectors from a scan. We can add this ability and exclude selectors before axe builder analyzes the page.

This will likely require a new input that takes a list of selectors to exclude from the scan.

• Add new input
• Update documentation (md) files
• Update action.yml files
• Add axeBuilder.exclude before running axeBuilder.analyze