feat(helm): GCP support

[nellh]

This includes major updates to our helm chart used for deployment to support GCP. This is intended to work well with GKE Autopilot.

Major changes:

• New Redis chart and switching to master only mode
• Load balancer ingress rewrite, no longer requires a separate controller chart
• New health checks since GCP uses these to configure its native load balancer health checks
• Disk allocation is no longer semi-automated, instead worker disks are pre-assigned and referenced in the config
• Updated documentation

Fixes #2658

[codecov]

Codecov Report

Merging #2666 (bd3dcf5) into master (3b8f37c) will decrease coverage by 0.00%.
The diff coverage is n/a.

❗ Current head bd3dcf5 differs from pull request most recent head f31ce9b. Consider uploading reports for the commit f31ce9b to get more accurate results

@@            Coverage Diff             @@
##           master    #2666      +/-   ##
==========================================
- Coverage   39.67%   39.67%   -0.01%     
==========================================
  Files         562      561       -1     
  Lines       34267    34266       -1     
  Branches      910      910              
==========================================
- Hits        13595    13594       -1     
  Misses      20547    20547              
  Partials      125      125              

Impacted Files	Coverage Δ
services/datalad/datalad_service/__init__.py

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