fix(functests): fix send_receipt_request 60s timeout, rebalance groups, add per-test timing

Fix send_receipt_request test that wasted 60s on every run:
- Change caps hash from sha-256 to sha-1 (profanity only supports sha-1
  for standard caps path, sha-256 goes to unsupported-hash fallback)
- Fix expected output: 'Buddy1 is online' → 'Buddy1 (laptop) is online'
  (resource is always shown for full JID presence)
- Wrap prof_output_exact in assert_true so mismatches fail fast instead
  of silently waiting the full expect_timeout

Rebalance test groups for parallel execution:
- Move Disco tests (14) from Group 3 → Group 1
- Move DB History tests (12) from Group 2 → Group 3
- Before: G1=31s G2=63s G3=30s G4=37s (bottleneck 63s)
- After:  G1=46s G2=38s G3=40s G4=36s (bottleneck 46s, -27%)

Add per-test wall-clock timing via clock_gettime(CLOCK_MONOTONIC)
in init_prof_test/close_prof_test for profiling individual tests.

tests/functionaltests/test_receipts.c

@@ -44,11 +44,11 @@ send_receipt_request(void **state)
         "<presence to='stabber@localhost' from='buddy1@localhost/laptop'>"
             "<priority>15</priority>"
             "<status>My status</status>"
-            "<c hash='sha-256' xmlns='http://jabber.org/protocol/caps' node='http://profanity-im.github.io' ver='hAkb1xZdJV9BQpgGNw8zG5Xsals='/>"
+            "<c hash='sha-1' xmlns='http://jabber.org/protocol/caps' node='http://profanity-im.github.io' ver='hAkb1xZdJV9BQpgGNw8zG5Xsals='/>"
         "</presence>"
     );
 
-    prof_output_exact("Buddy1 is online, \"My status\"");
+    assert_true(prof_output_exact("Buddy1 (laptop) is online, \"My status\""));
 
     prof_input("/msg Buddy1");
     prof_input("/resource set laptop");