Aerogear 10278 - Added secret renew API

[ziccardi]

Motivation

https://issues.redhat.com/browse/AEROGEAR-10278

What

Added the renewSecret to the VariantAdmin class

Why

The AdminUI has a feature to renew the secret

Verification Steps

1. Open the UPS admin UI and create a variant
2. Take note of the variantid and the application id
3. Write a small program using this version of the client library and call the new api:

   new UnifiedPushAdminClient('http://localhost:9999').
       variants.renewSecret('appId', 'variant type', 'variant id');

4. Refresh the AdminUI and verify that the variant secret has changed

Checklist:

• Code has been tested locally by PR requester
• Changes have been successfully verified by another team member

[github-actions]

Pull Request Test Coverage Report for Build 139633599

• 5 of 24 (20.83%) changed or added relevant lines in 5 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-9.2%) to 71.765%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/UnifiedPushAdminClient.ts	0	1	0.0%
src/errors/ErrorBuilder.ts	2	6	33.33%
src/errors/InternalError.ts	1	5	20.0%
src/errors/NotFoundError.ts	0	5	0.0%
src/variants/VariantsAdmin.ts	2	7	28.57%

Totals
Change from base Build 123655034:	-9.2%
Covered Lines:	103
Relevant Lines:	128

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💛 - Coveralls

[AindriuBrennan]

I tested this and it works!