fix: transform pooler url from api response

[sweatybridge]

What kind of change does this PR introduce?

closes #4185

What is the new behavior?

Removes placeholder value to avoid confusion.

Additional context

Add any other context or screenshots.

[coveralls]

Pull Request Test Coverage Report for Build 18483998815

Details

• 0 of 8 (0.0%) changed or added relevant lines in 1 file are covered.
• 5 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.05%) to 54.633%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
internal/link/link.go	0	8	0.0%

Files with Coverage Reduction	New Missed Lines	%
internal/gen/keys/keys.go	5	12.9%

Totals
Change from base Build 18470605567:	-0.05%
Covered Lines:	6409
Relevant Lines:	11731

---

💛 - Coveralls