feat: remove orgId dependency in authz

[niharbansal02]

This removes the dependency of the organization ID to be passed in the request.
A project can belong only to one organization, so the organization is extracted using the Project ID from the request.

This closes #104

[AkarshSatija]

Can we mention all the APIs being affected by this?

[coveralls]

Pull Request Test Coverage Report for Build 2815924228

• 14 of 20 (70.0%) changed or added relevant lines in 1 file are covered.
• 7 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.1%) to 50.852%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
internal/proxy/hook/authz/authz.go	14	20	70.0%

Files with Coverage Reduction	New Missed Lines	%
internal/proxy/hook/authz/authz.go	7	19.91%

Totals
Change from base Build 2799222616:	-0.1%
Covered Lines:	2329
Relevant Lines:	4580

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💛 - Coveralls