test: fix stratum alternative error unit test

[tdb3]

Unit test Parse stratum result alternative error was failing.
Reviewed stratum_api.c to confirm the appropriate parsing flow and adjusted the unit test accordingly.

Previously, the test was checking for message ID 1 (when the message contained id 8). Maybe this a copy/paste error? (let me know if I'm mistaken)
Additionally, now the test uses TEST_ASSERT_EQUAL_STRING to check the reject-reason string, and the string was
adjusted to match the message.

To build the unit tests, perform an interactive rebase to temporarily drop commit 61042d9 (see #607), (e.g. https://stackoverflow.com/a/1338758/26342368)

The test now passes:

Running Parse stratum result alternative error...
/home/dev/myrepos/ESP-MinerAlt/ESP-Miner/components/stratum/test/test_stratum_json.c:159:Parse stratum result alternative error:PASS

[WantClue]

@tdb3 this should fix the merge conflict hopefully correctly

[tdb3]

Thank you @WantClue