Legal API x Schema - Required fields are not validated for courtOrder

**Describe the bug in current situation**
On legal-api required fields are not validated for courtOrder jsonschema. The alteration schema is being validated as we can check with:
https://github.com/bcgov/business-schemas/blob/master/tests/unit/test_alteration.py#L143

**Link bug to the User Story**

**Impact of this bug**
Some additional validations will be added to legal-api to contain this issue

**Chance of Occurring (high/medium/low/very low)**

**Pre Conditions: which Env, any pre-requesites or assumptions to execute steps?**

**Steps to Reproduce**
Steps to reproduce the behavior:
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2. Click on '....'
3. Scroll down to '....'
4. See error

**Actual/ observed behavior/ results**

**Expected behavior**
A clear and concise description of what you expected to happen. Use the gherking language.

**Screenshots/ Visual Reference/ Source**
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