TPT-4706: Fix monitor property mutability

[zliang-akamai]

📝 Description

Four monitor model properties pass enum classes to Property as positional arguments. That argument controls mutability rather than value conversion, so these read-only API fields were inadvertently writable. Use the default Property() declaration to keep their API values unchanged and prevent them from being included in update payloads.

✔️ How to Test

python -m pytest test/unit/objects/monitor_test.py -q

[Copilot]

Copilot review overview

🟡 Changes recommended

Add regression coverage confirming the fields cannot be assigned and are excluded from save() payloads.

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Review effort: Lite
Findings: 1

Open (1)

• Add regression tests for immutable properties and PUT payload exclusion · New

What changed in this PR

Fixes monitor property declarations so four API fields remain read-only and are excluded from update payloads.

Changes:

• Replaces positional enum arguments with Property().
• Corrects mutability for dashboard, service, and alert fields.

File	Summary
linode_api4/​objects/​monitor.py	Corrects mutability declarations for four monitor properties.

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