Feature/bcss 20021 creating a new calendar picker util (#17)

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<!-- Describe your changes in detail. -->
This PR is adding a new util to be able to use the calendar clickers on
BCSS.
There are two main methods that cover both the v1 and v2 calendar
clicker along with functions to do specific tasks within each method.

<!-- Why is this change required? What problem does it solve? -->
This was added so that we could have a general utility to call whenever
we need to use a calendar clicker during our automated tests.

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the boxes that apply. -->

- [x] 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)

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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/base_page.py

@@ -87,6 +87,9 @@ def bowel_cancer_screening_system_header_is_displayed(self) -> None:
         expect(self.bowel_cancer_screening_system_header).to_contain_text(
             "Bowel Cancer Screening System"
         )
+        expect(self.bowel_cancer_screening_system_header).to_contain_text(
+            "Bowel Cancer Screening System"
+        )
 
     def main_menu_header_is_displayed(self) -> None:
         expect(self.main_menu__header).to_contain_text("Main Menu")