[Desktop] Set the updater endpoint at build time

[jumde]

Description

Use npm config to set the updater config at build time.

Test Plan

Specified here: #10281

[LaurenWags]

Labeling as QA/Blocked as I've requested test plan clarification from @jumde

[LaurenWags]

Verified passed with

Brave | 1.12.104 Chromium: 84.0.4147.89 (Official Build) dev (64-bit)
-- | --
Revision | 19abfe7bcba9318a0b2a6bc6634a67fc834aa592-refs/branch-heads/4147@{#852}
OS | macOS Version 10.14.6 (Build 18G3020)

• Verified test plan from Fix 10279: Set updater endpoint at build time #10281
• Using production go-updater:

• Using dev go-updater:

---

Verification passed on

Brave	1.12.104 Chromium: 84.0.4147.89 (Official Build) dev (64-bit)
Revision	19abfe7bcba9318a0b2a6bc6634a67fc834aa592-refs/branch-heads/4147@{#852}
OS	Ubuntu 18.04 LTS

• Production
  

• Using dev go-updater:
  

[GeetaSarvadnya]

Verification passed on

Brave | 1.12.104 Chromium: 84.0.4147.89 (Official Build) dev (64-bit)
-- | --
Revision | 19abfe7bcba9318a0b2a6bc6634a67fc834aa592-refs/branch-heads/4147@{#852}
OS | Windows 10 OS Version 1903 (Build 18362.959)

• Verified the test plan from Fix 10279: Set updater endpoint at build time #10281

Using production go-updater

• Ensured that the following components download successfully in brave://components
  • Brave Local Data Update
  • Brave Ad Block Updater
  • Brave Tor Client Updater
  • NTP Sponsored Images (US)
  • Brave SpeedReader Updater
  • Brave HTTPS Everywhere Updater
  • CRLSets

with --use-dev-goupdater-url

• Ensured that the above components download successfully in brave://components