Cleanup WorkflowLevel2 model by removing unused fields

[glind]

Confirm they are not in use in the Front End (TolaDatav2) and remove the following fields from the model Workflow.WorkflowLevel2

date_of_request = models.DateTimeField("Date of Request", blank=True, null=True)
staff_responsible = models.ForeignKey(TolaUser, on_delete=models.SET_NULL, blank=True, null=True)
partners = models.ForeignKey(Partner, blank=True, null=True, verbose_name="Partners", on_delete=models.SET_NULL)
total_estimated_budget = models.DecimalField("Total Project Budget", decimal_places=2, max_digits=12, help_text="In USD", default=Decimal("0.00"), blank=True)
local_currency = models.ForeignKey(Currency, null=True, blank=True, related_name="local_project", on_delete=models.SET_NULL)
donor_currency = models.ForeignKey(Currency, null=True, blank=True, related_name="donor_project", on_delete=models.SET_NULL)
actual_start_date = models.DateTimeField(blank=True, null=True)
actual_end_date = models.DateTimeField(blank=True, null=True)
actual_duration = models.CharField(max_length=255, blank=True, null=True)
on_time = models.BooleanField(default=True)
no_explanation = models.TextField("If not on time explain delay", blank=True, null=True)
actual_cost = models.DecimalField("Actual Cost", decimal_places=2, max_digits=20, default=Decimal("0.00"), blank=True, help_text="What was the actual final cost? This should match any financial documentation you have in the file. It should be completely documented and verifiable by finance and any potential audit")
actual_cost_date = models.DateTimeField(blank=True, null=True)
budget_variance = models.CharField("Budget versus Actual variance", blank=True, null=True, max_length=255)
explanation_of_variance = models.CharField("Explanation of variance", blank=True, null=True, max_length=255)
total_cost = models.DecimalField("Estimated Budget for Organization", decimal_places=2, max_digits=12, help_text="In USD", default=Decimal("0.00"), blank=True)
agency_cost = models.DecimalField("Actual Cost for Organization", decimal_places=2, max_digits=12, help_text="In USD", default=Decimal("0.00"), blank=True)
community_handover = models.BooleanField("CommunityHandover/Sustainability Maintenance Plan", help_text='Check box if it was completed', default=False)