fix: convert all paths to relative for deploy

[sweatybridge]

What kind of change does this PR introduce?

Bug fix

What is the current behavior?

failed to load import map: readfile /Users/qiao/work/cli/supabase/functions/deno.json: invalid argument

What is the new behavior?

No error when bundling with import map flag

supabase functions deploy test --import-map supabase/functions/deno.json --use-api

Additional context

Add any other context or screenshots.

[coveralls]

Pull Request Test Coverage Report for Build 14339664396

Details

• 6 of 11 (54.55%) changed or added relevant lines in 1 file are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.005%) to 51.131%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/function/deploy.go	6	11	54.55%

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

Totals
Change from base Build 14329846778:	-0.005%
Covered Lines:	7005
Relevant Lines:	13700

---

💛 - Coveralls