Add hint when user is using non-A/B OTA.
Add hint when user is using non-A/B OTA.

Disable the 'Analyse COW operation' button and add a tooltip 'This is
only supported in A/B OTA'.

Test: tested by non-A/B OTA package.
Change-Id: Ib6be1671f9106ee7e332cd2d0937c666a912a26e

google/ota-analyzer,google/ota-analyzer,google/ota-analyzer