LATEST_STABLE edgedriver version can't be found for some OSes

[aleksandr-kotlyar]

Problem

LATEST_STABLE edgedriver version can't be found for some OSes. (Found at report #302)

Root cause

Bug in edgedriver release process. When LATEST_STABLE version has not released for all OSes at one time.

Proposal solution

Here is improved algorithm for EdgeChromiumDriver.get_latest_release_version() New steps marked with bold.

1. If MSEdge browser version was not determined - take LATEST_STABLE version. (new step)
2. Parse major version from LATEST_STABLE. (new step)
3. Create LATEST_RELEASE_MAJORVERSION_OS link.
4. Get LATEST_RELEASE_MAJORVERSION_OS driver version.
5. Download the driver.