Use direct DbHost from response in branches get

[takumihara]

What kind of change does this PR introduce?

This is a bug fix for the branches get command. Currently, it returns an incorrect host in the PostgreSQL URL.

What is the current behavior?

The PostgreSQL URL contains a redundant db.***.supabase.co.

> supabase branches get --experimental --output json                                                                                         develop
{
  "POSTGRES_URL": "postgresql://postgres:[password]@db.db.[project-id].supabase.co.supabase.co:5432/?connect_timeout=10"
}

What is the new behavior?

> go run . branches get --experimental --output json
{
  "POSTGRES_URL": "postgresql://postgres:[password]@db.[project-id].supabase.co:5432/?connect_timeout=10"
}

[coveralls]

Pull Request Test Coverage Report for Build 12850072932

Details

• 0 of 1 (0.0%) changed or added relevant line in 1 file are covered.
• 7 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.02%) to 58.367%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
internal/branches/get/get.go	0	1	0.0%

Files with Coverage Reduction	New Missed Lines	%
internal/storage/rm/rm.go	2	89.53%
internal/gen/keys/keys.go	5	12.9%

Totals
Change from base Build 12825243990:	-0.02%
Covered Lines:	7590
Relevant Lines:	13004

---

💛 - Coveralls