[IEDriver] Ignore process id match when finding the window handle - IE Mode on Edge.

[diemol]

This assumes a single Edge instance is running
on the host. Not suited for running sessions
in parallel, or having another Edge browser
manually at the same time, because it will
most likely lead to return the wrong window
handle.

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#12091 describes the issue where running IEDriver combined with IE Mode on Edge under an admin window does not work. This happens because under these conditions Edge is launched in a forked process without privileges, and then the process id IEDriver gets is different from the one it actually uses.

This PR introduces a flag (ie.ignoreprocessmatch) which avoids the process id matching, and IEDriver can use the launched Edge browser.

Description

All the previous assumes a single Edge instance is running on the host. This is not suited for running sessions in parallel, or having another Edge browser opened manually at the same time, because it will most likely lead to return the wrong window handle.

{
  "capabilities": {
		"alwaysMatch": {
			"browserName": "internet explorer",
			"se:ieOptions": {
				"ie.edgechromium": true,
				"ie.ignoreprocessmatch": true
			}
		},
    "firstMatch": [{}]
  }
}

Motivation and Context

Allows users to run IEDriver with IE Mode under admin shells with the caveats described above.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the contributing document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.