Add retry to mitigate the pagination issue

Problem:
The issue is because some "RuntimeMetadata" documents are missing for
some AppFunctions. We have a theory that the search API from
 AppSearch has an intermittent issue when returning multiple pages.
Somehow, in a rare scenario, the search API seems to return only the
first page (10 documents by default) even though more pages exist.
This is causing the MetadataSyncAdapter to think there are only 10
AppFunctions and thus remove the RuntimeMetadata of the rest.

Mitigation:
When MetadataSyncAdapter searches for static metadata and gets exactly 10
(the default page size) documents, send another search with a much higher
page size.

With this, we maintain the existing behavior for the majority of calls
that are unaffected. Thus, it should be a low-risk fix.

Bug: b/400670498

Test: Existing tests
Test: manually modify appsearch to not sending more pages
if the default page count is used. Can see the log:
"03-26 17:06:40.609  1745  3484 D AppFunction: b/400587895: First search yields 10 results, but the second one with higher page size yields 41 results. schemaType = AppFunctionStaticMetadata"

Change-Id: Ibe9a6da5df42ccd5bf247bef7e218198471fac16