[MBL-1896] Update status label copy for PLOT-enabled pledges

[jovaniks]

📲 What

This PR updates the status label copy for PLOT-enabled pledges to display the correct payment information, such as the first charge amount and collection date, in the "Manage Pledge" screen.

🤔 Why

For backers using the Pledge Over Time (PLOT) payment plan, it is important to display clear and accurate details about the next payment. Updating the status label copy ensures backers know when the first charge will occur and the corresponding amount, aligning with the PLOT functionality.

🛠 How

• Since the backing.PaymentIncrements API is not yet available (MBL-1851), a temporary validation has been added for development and testing purposes.
• The featurePledgeOverTimeEnabled() flag is used to simulate that a pledge is PLOT-enabled.
• Mock data (mockPledgePaymentIncrement) is used to represent the paymentIncrements list.
  • The first record from paymentIncrements provides the amount and scheduled payment date for the status label.
• Updated the statusLabelText logic to display the dynamic copy:

  -"You selected Pledge Over Time. If the project reaches its funding goal, the first charge of $20 will be collected on March 15, 2024."

👀 See

Jira

No PLOT	After 🦋

✅ Acceptance criteria

• The status label displays the correct copy when featurePledgeOverTimeEnabled() is true.
• Mock data (mockPledgePaymentIncrement) is used for amount and date for testing purposes.
• The updated copy dynamically shows the first scheduled payment's amount and date.
• The copy is not shown for non-PLOT pledges (featurePledgeOverTimeEnabled = false).

⏰ TODO

• Replace mock data (mockPledgePaymentIncrement) with real backing.PaymentIncrements once the API is available (MBL-1851).
• Replace the text with translations