Support using both --jq and --template for gh repo list #8734

Describe the feature or problem you’d like to solve

I'd like to use the gh repo list command to list the repositories of an organisation, grouped by primary language, in Markdown, ie. something like:

## Language 1

- Repo 1
- Repo 2

## Language 2

- Repo 3
- Repo 4

To get the data I need, I can use the following command: gh repo list cli --json name,primaryLanguage, which will output something like:

[
  {
    "name": "cli",
    "primaryLanguage": {
      "name": "Go"
    }
  },
  {
    "name": "go-gh",
    "primaryLanguage": {
      "name": "Go"
    }
  }
]

Then I can use the --jq option to get the data structure I need: gh repo list cli --json name,primaryLanguage --jq '. | reduce .[] as { $primaryLanguage, $name } ({}; .[$primaryLanguage.name | tostring] += [$name])', which will output:

{
  "Go": [
    "cli",
    "go-gh",
    "safeexec",
    "browser",
    "gh-webhook",
    "shurcooL-graphql",
    "oauth"
  ],
  "Shell": [
    "gh-extension-precompile"
  ],
  "null": [
    "scoop-gh"
  ]
}

Now, to get the output I shown above (in Markdown), I can use --template, with something like: gh repo list cli --json name,primaryLanguage --jq '. | reduce .[] as { $primaryLanguage, $name } ({}; .[$primaryLanguage.name | tostring] += [$name])' --template '{{ range $language, $repositories := . }}## {{ .language }}{{ "\n\n" }}{{ range $repository := $repositories }}- {{ .name }}{{ "\n" }}{{ end }}{{ end }}'. But that will give me the same output as before (the JSON object).

The other way around, running gh repo list cli --json name,primaryLanguage --template '{{ range . }}- {{ .name }}{{ "\n" }}{{ end }}' will output:

- cli
- go-gh
- safeexec
- browser
- gh-extension-precompile
- gh-webhook
- shurcooL-graphql
- oauth
- scoop-gh

But adding --jq '.' will give me JSON:

[
  {
    "name": "cli",
    "primaryLanguage": {
      "name": "Go"
    }
  },
  {
    "name": "go-gh",
    "primaryLanguage": {
      "name": "Go"
    }
  }
]

Proposed solution

Supporting both the --jq and --template options together allows user to manipulate the data before formatting them.

Additional context

I'm using the latest version of GitHub's cli to date:

> gh --version
gh version 2.44.1 (2024-02-16)
https://github.com/cli/cli/releases/tag/v2.44.1