Revert part of PR #3638 which is part of a now-abandoned task priorit…

…y PR series (#3750)

PR #3638 introduced parameters and documentation for a task priority
field which was never implemented in mainline Parsl. This PR leaves most
of the infrastructure in place, as other code now depends on it, but
removes `priority` as a valid resource specification field.

# Changed Behaviour

users trying to use the no-effect priority parameter will now get
runtime errors rather than silent ignore.

## Type of change

- Code maintenance/cleanup

parsl/executors/high_throughput/executor.py

@@ -8,7 +8,7 @@
 from collections import defaultdict
 from concurrent.futures import Future
 from dataclasses import dataclass
-from typing import Callable, Dict, List, Optional, Sequence, Tuple, Union
+from typing import Callable, Dict, List, Optional, Sequence, Set, Tuple, Union
 
 import typeguard
 
@@ -357,10 +357,8 @@ def worker_logdir(self):
         return self.logdir
 
     def validate_resource_spec(self, resource_specification: dict):
-        """HTEX supports the following *Optional* resource specifications:
-        priority: lower value is higher priority"""
         if resource_specification:
-            acceptable_fields = {'priority'}
+            acceptable_fields: Set[str] = set()  # add new resource spec field names here to make htex accept them
             keys = set(resource_specification.keys())
             invalid_keys = keys - acceptable_fields
             if invalid_keys:

parsl/tests/test_htex/test_resource_spec_validation.py

@@ -30,13 +30,6 @@ def test_resource_spec_validation():
     assert ret_val is None
 
 
-@pytest.mark.local
-def test_resource_spec_validation_one_key():
-    htex = HighThroughputExecutor()
-    ret_val = htex.validate_resource_spec({"priority": 2})
-    assert ret_val is None
-
-
 @pytest.mark.local
 def test_resource_spec_validation_bad_keys():
     htex = HighThroughputExecutor()