Fix batch mode treating error payloads as minion IDs

[d3zorg]

What does this PR do?

Batch mode could incorrectly treat transport-level error payloads (e.g. {"error": "...", "failed": True}) as valid minion IDs, leading to spurious "Minion 'error' failed to respond" messages and incorrect batch tracking.

What issues does this PR fix or reference?

Issues: #46876 #48509 #50238 #60724
PRs: #53159 #54725 #54923

Previous Behavior

Running batched commands like salt -b4 *-minion* test.ping caused loads of extra errors that are not actual errors and minion payloads misinterpreted:

Executing run on ['minion1xxx', 'error', 'minion2xxx, 'minion3xxx']

minion error was already deleted from tracker, probably a duplicate key
minion error was already deleted from tracker, probably a duplicate key
minion error was already deleted from tracker, probably a duplicate key
minion error was already deleted from tracker, probably a duplicate key
[ERROR   ] An un-handled exception was caught by Salt's global exception handler:
KeyError: 'ret'
Traceback (most recent call last):
  File "/usr/bin/salt", line 12, in <module>
    sys.exit(salt_main())
  File "/opt/saltstack/salt/lib/python3.10/site-packages/salt/scripts.py", line 529, in salt_main
    client.run()
  File "/opt/saltstack/salt/lib/python3.10/site-packages/salt/cli/salt.py", line 55, in run
    self._run_batch()
  File "/opt/saltstack/salt/lib/python3.10/site-packages/salt/cli/salt.py", line 291, in _run_batch
    for res, job_retcode in batch.run():
  File "/opt/saltstack/salt/lib/python3.10/site-packages/salt/cli/batch.py", line 326, in run
    ret[minion] = data["ret"]
KeyError: 'ret'
Traceback (most recent call last):
  File "/usr/bin/salt", line 12, in <module>
    sys.exit(salt_main())
  File "/opt/saltstack/salt/lib/python3.10/site-packages/salt/scripts.py", line 529, in salt_main
    client.run()
  File "/opt/saltstack/salt/lib/python3.10/site-packages/salt/cli/salt.py", line 55, in run
    self._run_batch()
  File "/opt/saltstack/salt/lib/python3.10/site-packages/salt/cli/salt.py", line 291, in _run_batch
    for res, job_retcode in batch.run():
  File "/opt/saltstack/salt/lib/python3.10/site-packages/salt/cli/batch.py", line 326, in run
    ret[minion] = data["ret"]
KeyError: 'ret'

New Behavior

Receiving proper execution list without tons of errors and failing halfway through minion list:

Executing run on ['minion1xxx', 'minion4xxx', 'minion2xxx, 'minion3xxx']
...
jid:
    20260130100634363546
retcode:
    0
minion4xxx:
    True
jid:
    20260130100634363546
retcode:
   0
....

Merge requirements satisfied?

[NOTICE] Bug fixes or features added to Salt require tests.

• Docs
• Changelog - fb66c40
• Tests written/updated

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[twangboy]

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