feat(git): add .LatestTag template property

[mateusz-bajorek]

Prerequisites

• I have read and understood the contributing guide.
• The commit message follows the conventional commits guidelines.
• Tests for the changes have been added (for bug fixes / features).
• Docs have been added/updated (for bug fixes / features).

Description

🤖 Generated by Copilot at 39bff29

This pull request adds a new option to the Git segment to show the latest tag name for the current git repo. It also updates the documentation and the theme schema to reflect the new feature.

How

🤖 Generated by Copilot at 39bff29

• Add a new feature to the git segment that allows users to display the latest tag name for the git repo in their prompt (link, link, link, link, link, link)
• Add a new boolean property FetchLatestTag to the segments package and the themes/schema.json file, with a default value of false and a title and description for the user interface (link, link)
• Add a new string field LatestTag to the Git type, which stores the latest tag name for the git repo (link)
• Add a new block of code to the Enabled function of the Git type, which checks if the FetchLatestTag property is set to true, and if so, runs a git command to get the latest tag name and assigns it to the LatestTag field (link)
• Add a new row to the table in the website/docs/segments/git.mdx file, which documents the FetchLatestTag property and its default value and description for the users of the git segment (link)
• Add a new row to the table in the website/docs/segments/git.mdx file, which documents the .LatestTag template variable and its type and description for the users of the git segment (link)

[JanDeDobbeleer]

@mateusz-bajorek thanks for your contribution! I have a suggestion here. If we make LatestTag a function instead of something to enable using a switch, we do not need the switch:

func (g *Git) LatestTag() string {
    return g.getGitCommandOutput("describe", "--tags", "--abbrev=0")
}

[mateusz-bajorek]

@JanDeDobbeleer oh nice! I wasn't aware this could get picked up like that, very nifty! PR updated :)