feat(CP-3072): replace buy now with exchange prize for loyalty program

[adelelshafey]

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

• Feature — replace "Buy Now" button with "Exchange Prize" for the loyalty program

What is the current behaviour? (You can also link to an open issue here)

• The loyalty program product cards show a "Buy Now" button

What is the new behaviour? (You can also link to the ticket here)

• Product cards in the loyalty program show an "Exchange Prize" button instead of "Buy Now"
• Ticket: https://salla.atlassian.net/browse/CP-3072

Does this PR introduce a breaking change?

• No

Screenshots (If appropriate)

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Metrics 0 complexity · 0 duplication

Metric	Results
Complexity	0
Duplication	✅ 0 (≤ 2 duplication)

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