Re-enabled the emulator caching in CI.

[MohitMaliFtechiz]

Fixes #3978

• Stabilized the emulator caching; CI is now running without errors related to caching.
• Configured the emulator to use 3GB of RAM and a 1024MB SD card instead of 4GB of RAM and a 2048MB SD card to reduce resource usage on CI. Since the emulator works well with 3GB of RAM and a 1024MB SD card on CI for running test cases for custom apps, it is better to use this configuration for the app's test cases as well.
• Now we are generating the codecov report on API level 30 instead of API level 25, since some instrumentation test cases, we are running on API level 30 and above, like testing the WifiHotspot, ShowingPlayStoreRestriction in HelpFragment, etc. This change increased the code coverage by 2.75%.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 57.76%. Comparing base (829ec53) to head (16cbe2a). Report is 4 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #3982 +/- ## ============================================ + Coverage 55.00% 57.76% +2.75% - Complexity 1504 1572 +68 ============================================ Files 310 310 Lines 12547 12547 Branches 1590 1590 ============================================ + Hits 6902 7248 +346 + Misses 4672 4251 -421 - Partials 973 1048 +75 ```

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