[source-mssql] improving discovery of large mssql database #46515
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What
Partially fixes #42491
This is a cherry-pick of the change from this community PR
#43421
The purpose of this PR is to get this merged sooner due to an internal priority change. (There is a lack of response in the original PR)
How
From the original PR:
"If the connector is configured to synchronize only particular schemas the schema discovery step will download only columns of tables of each schema rather than downloading all columns for the whole database and then filtering down to necessary schemas."
Review guide
User Impact
Can this PR be safely reverted and rolled back?