Feature/bcss 21219 selenium to playwright endoscopyinvesigationdatasetscenarios 17 18 (#120)

<!-- markdownlint-disable-next-line first-line-heading -->
## Description

<!-- Describe your changes in detail. -->
Migrating scenarios 17 - 18 from the
EndoscopyInvestigationDatasetScenarios feature file:

17: 
Scenario: Check cross-field validation between the Bowel Preparation
Administered and Bowel Preparation Quality fields in an incomplete
Colonoscopy investigation dataset
18:
Scenario: Check cross-field validation between the General
Anaesthetic/Other Drugs Administered and the Sedation fields in an
incomplete Colonoscopy investigation dataset

## Context

<!-- Why is this change required? What problem does it solve? -->
Migrating scenarios 17 - 18 from the
EndoscopyInvestigationDatasetScenarios feature file:

17: 
Scenario: Check cross-field validation between the Bowel Preparation
Administered and Bowel Preparation Quality fields in an incomplete
Colonoscopy investigation dataset
18:
Scenario: Check cross-field validation between the General
Anaesthetic/Other Drugs Administered and the Sedation fields in an
incomplete Colonoscopy investigation dataset

## Type of changes

<!-- What types of changes does your code introduce? Put an `x` in all
the boxes that apply. -->

- [ ] Refactoring (non-breaking change)
- [x] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would change existing
functionality)
- [ ] Bug fix (non-breaking change which fixes an issue)

## Checklist

<!-- Go over all the following points, and put an `x` in all the boxes
that apply. -->

- [x] I am familiar with the [contributing
guidelines](https://github.com/nhs-england-tools/playwright-python-blueprint/blob/main/CONTRIBUTING.md)
- [x] I have followed the code style of the project
- [x] I have added tests to cover my changes (where appropriate)
- [x] I have updated the documentation accordingly
- [ ] This PR is a result of pair or mob programming

---

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Author: adrianoaru-nhs

pages/datasets/investigation_dataset_page.py

@@ -1478,6 +1478,17 @@ class EndoscopeNotInsertedOptions(StrEnum):
     UNSCHEDULED_ATTENDANCE_TIME = "203001"
 
 
+class SedationOptions(StrEnum):
+    """Enum for sedation options"""
+
+    UNSEDATED = "18504~Read-only"
+    AWAKE = "17324"
+    DROWSY = "17325"
+    ASLEEP_BUT_RESPONDING_TO_NAME = "17326"
+    ASLEEP_BUT_RESPONDING_TO_TOUCH = "17327"
+    ASLEEP_AND_UNRESPONSIVE = "17328"
+
+
 # Registry of all known Enums to search when matching string values
 ALL_ENUMS: List[type[Enum]] = [
     obj