ITS:Converge 3A and take capture in same session

During torch strength control capture, currently 3A convergence and
capture happens in a different session due to which the 3A settings are
wiped off during the capture making it incorrectly exposed.
Reuse session from 3A during image capture to avoid this issue.

Bug: 377163158
Test: Verified by Pixel team.
FLAG: TEST_ONLY
Change-Id: I484d4d11e6eaff17c36e8dd7d0431f238cd4b1ee