Get ePolyScat run lifecycle working: SDK enum compat, resource surfac…

[Softicles]

SDK enum API compatibility (models.py, views.py)

• Situation: The installed airavata-python-sdk generates ExperimentState and DataType as enum.IntEnum, but the code still used the old Thrift-generated _VALUES_TO_NAMES / _NAMES_TO_VALUES lookup dicts, which no longer exist.
• Task: Restore enum<->name lookups in a way compatible with the IntEnum API.
• Action: Replaced _VALUES_TO_NAMES[x] with EnumType(x).name and _NAMES_TO_VALUES[name] with EnumType[name].value across experiment-status and output data-type handling.
• Result: Status tracking and output-type resolution no longer raise AttributeError; experiment state is read correctly.

Expose the compute resource on the Run API (serializers.py)

• Situation: The runs listing needed to show which compute resource each run targets, but RunSerializer did not expose a resource field.
• Task: Surface the resource in the run's API representation.
• Action: Enabled the resource SerializerMethodField and added "resource" to RunSerializer.Meta.fields.
• Result: The API returns each run's resource (e.g. login.expanse.sdsc.edu).

Align the Run DB schema with nullable model fields (migrations/0023)

• Situation: Creating a run via the API failed with HTTP 500 "NOT NULL constraint failed: epolyscat_django_app_run.experiment_id" because the database still enforced NOT NULL on columns the model declares nullable.
• Task: Bring the schema in line with the model so a run can be created without an experiment/root.
• Action: Generated the missing migration altering experiment, filepath, number and root on run.
• Result: Run creation succeeds and experiment-less runs persist.

Redesign the Runs table (Runs.vue)

• Situation: The runs table showed a Last Modified column, sorted by date, with one action set for every context and no way to filter.
• Task: Match the new design—show the target resource, allow filtering, and tailor row actions to the viewing context.
• Action: Added a filter search box, replaced Last Modified with a Resource column (sorted by resource name), and split row actions into an All-Runs set (clone, delete) versus a view/tutorial set (remove, clone, submit/resubmit, delete); refreshed layout and icons.
• Result: Runs are filterable, display their resource, and show context-appropriate actions.