cdc: Update the initial scan syntax for ALTER changefeeds #86588
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Update ALTER changefeed o handle initial_scan, no_initial_scan,
initial_scan = 'yes|no|only' options.
Note: Backport of #82634 was not clean; In particular, the test was not backported
as it relies on new testing utilities, and the options change does not include
new options handling.
Release note: None
Release Justification: usability improvement.