Reland "Add browser test for FETCH_SUPPORT_PACKET remote command"

This is a reland of commit 02a125795f6e3c9366db3cbaa6b95ce9120687d7
which got reverted on commit I274d362c7b02e1963c8c4784e9f303dcbf08d462

Fix by using PRId64 on formatter when printing int64_t

Original change's description:
> Add browser test for FETCH_SUPPORT_PACKET remote command
>
> Add browser test that uses RemoteCommandsServiceMixin to
> FETCH_SUPPORT_PACKET command. For easier testing, add static
> SetTargetDirForTesting() function to DeviceCommandFetchSupportPacketJob.
> A temporary directory will be created and generated log file will be
> written there for testing. Along with this addition remove
> SetTargetDirForTesting() and GetExportedFilepathForTesting() functions.
> Use `reporting::ReportingClient::TestEnvironment` as a test environment
> to capture the enqueued events on the reporting pipeline. With this
> addition, we don't need
> DeviceCommandFetchSupportPacketJob::SetReportQueueForTesting() function
> anymore so remove it.
> Update the unit test according to these changes on
> DeviceCommandFetchSupportPacketJob testing functions.
>
> Bug: b:313072234
> Change-Id: I6c018fa5f114fdd8c6b97d9833fe801befe3de2b
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5153171
> Reviewed-by: Pavol Marko <pmarko@chromium.org>
> Reviewed-by: Leonid Baraz <lbaraz@chromium.org>
> Commit-Queue: Irem Uguz <iremuguz@google.com>
> Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
> Cr-Commit-Position: refs/heads/main@{#1247068}

Bug: b:313072234
Change-Id: Ib75414b97a94e5cba7ba0ed4023a066ccd74341e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5204345
Commit-Queue: Irem Uguz <iremuguz@google.com>
Reviewed-by: Pavol Marko <pmarko@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1248662}