Validate: add ability to expand src validate commands for future health check functionality

[jdpleiness]

To support expansion of the src validate command with new health check features, the validate command needs to be broken down into subcommands.

This PR moves the current src validate command to src validate install as this command validates a Sourcegraph installation is setup and working correctly. Additional changes and features are listed below:

• Switch to using existing internal/api package for GraphQL queries
• Remove create first admin feature that allowed the validate command to create a Sourcegraph admin user
• Refactor configuration layout to allow easier support for multiple code hosts in the future. src validate currently only supports GitHub, but adding additional code hosts such as GitLab is now much easier.
• Add visual feedback to CLI for success or failure of steps
• Add cleanup of insight testing as mentioned here
• Move GitHub token from config file to an environmental variable in alignment with other account tokens

TODO:

• Update CHANGELOG.md

Test plan

Locally tested changes using latest Sourcegraph Helm install. Tested default configuration if no YAML is provided, YAML configuration provided, and JSON configuration provided.

• ran go test ./... - all tests passing
• ran staticcheck ./... - no issues found in new code

Example YAML file used:

externalService:
  kind: GITHUB
  displayName: srcgraph-test
  deleteWhenDone: true
  maxRetries: 5
  retryTimeoutSeconds: 5
  config:
    gitHub:
      url: https://github.com
      orgs: []
      repos:
        - sourcegraph-testing/zap

searchQuery:
  - repo:^github.com/sourcegraph-testing/zap$ test
  - repo:^github.com/sourcegraph-testing/zap$@v1.14.1 test

insight:
  title: "Javascript to Typescript migration"
  dataSeries:
    [ {
      "query": "lang:javascript",
      "label": "javascript",
      "repositoryScope": [
        "github.com/sourcegraph/sourcegraph"
      ],
      "lineColor": "#6495ED",
      "timeScopeUnit": "MONTH",
      "timeScopeValue": 1
    },
      {
        "query": "lang:typescript",
        "label": "typescript",
        "lineColor": "#DE3163",
        "repositoryScope": [
          "github.com/sourcegraph/sourcegraph"
        ],
        "timeScopeUnit": "MONTH",
        "timeScopeValue": 1
      }
    ]

Example JSON file used:

{
  "externalService": {
    "kind": "GITHUB",
    "displayName": "srcgraph-test",
    "deleteWhenDone": true,
    "maxRetries": 5,
    "retryTimeoutSeconds": 5,
    "config": {
      "gitHub": {
        "url": "https://github.com",
        "orgs": [],
        "repos": [
          "sourcegraph-testing/zap"
        ]
      }
    }
  },

  "searchQuery": [
    "repo:^github.com/sourcegraph-testing/zap$ test",
    "repo:^github.com/sourcegraph-testing/zap$@v1.14.1 test"
  ],

  "insight": {
    "title": "Javascript to Typescript migration",
    "dataSeries": [
      {
        "query": "lang:javascript",
        "label": "javascript",
        "repositoryScope": [
          "github.com/sourcegraph/sourcegraph"
        ],
        "lineColor": "#6495ED",
        "timeScopeUnit": "MONTH",
        "timeScopeValue": 1
      },
      {
        "query": "lang:typescript",
        "label": "typescript",
        "lineColor": "#DE3163",
        "repositoryScope": [
          "github.com/sourcegraph/sourcegraph"
        ],
        "timeScopeUnit": "MONTH",
        "timeScopeValue": 1
      }
    ]
  }

}

[abeatrix]

I like how nice the output looks!
Idea: In addition to the current output, I think it'd be nice to show the services each task are related to, so that if one of test fails, the user will know what to look into?

[abeatrix]

This is great! On top of performing an indexed search and unindexed search, do you think it'd be helpful to add a default symbol search (confirm connection to the symbol service)?

[jdpleiness]

Yeah, thats a good idea!

[jdpleiness]

Just added a symbol search to the defaults, should be gtg.

[abeatrix]

I just noticed https://github.com/gorilla/mux has been archive so the search queries will no longer work. We might want to use another repo for default

[jdpleiness]

I've swapped out gorilla/mux for sourcegraph/cli in the default params.

Example of new changes:

[abeatrix]

yay thanks for the quick update! LGTM!

[DaedalusG]

Late to the party but this looks great!