Revert "Optimize euicc invocations by keeping channel open sessi..."

Revert submission 28659491

Reason for revert: causing merge conflict while reverting curlprit cl ag/27163141 for the regression b/363412105, b/369170606

Reverted changes: /q/submissionid:28659491
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:6bd93036d81505d0858bbb0b2c50b8b7d9e4beb4)
Merged-In: Ibf4965aebe4bb6de928e133e1dc4589f239beed7
Change-Id: Ibf4965aebe4bb6de928e133e1dc4589f239beed7