Refactor component-updater code

[jumde]

Description

1. In brave-core, we set the component-updater URLs in browser/net/brave_common_static_redirect_network_delegate_helper.cc. This can be simplified by setting the URLs using the command line flag.

2. For the service-key, we can override BuildUpdateCheckExtraRequestHeaders to add the header to the updater requests.

Test Plan

Specified here - https://github.com/brave/internal/issues/802

[stephendonner]

Verified PASSED using

Brave	1.32.66 Chromium: 95.0.4638.40 (Official Build) nightly (x86_64)
Revision	e3e7c76ba0284b16087cf4cf3153abfaef6470c7-refs/branch-heads/4638@{#624}
OS	macOS Version 11.6 (Build 20G165)

Verification notes in https://github.com/brave/internal/issues/802#issuecomment-941549684

Verification passed on

Brave | 1.32.78 Chromium: 95.0.4638.54 (Official Build) beta (64-bit)
-- | --
Revision | d31a821ec901f68d0d34ccdbaea45b4c86ce543e-refs/branch-heads/4638@{#871}
OS | Windows 10 Version 21H1 (Build 19043.1288)

Verification notes in https://github.com/brave/internal/issues/802#issuecomment-941549684

---

Verified PASSED using

Brave	1.32.87 Chromium: 95.0.4638.69 (Official Build) beta (64-bit)
Revision	6a1600ed572fedecd573b6c2b90a22fe6392a410-refs/branch-heads/4638@{#984}
OS	Linux

Verification notes in https://github.com/brave/internal/issues/802#issuecomment-941549684