Add datetime formatting capability to variable set task

[Copilot]

This pull request adds support for setting variables to the current date/time in the vsts-variable-set task, allowing users to specify a custom format for the date/time value. It also updates TypeScript build info files for both vsts-variable-set and vsts-variable-transform tasks to reflect the latest build.

New date/time variable feature

• Added a new option "datetime": "current date/time" to the From pick list in vsts-variable-set/v3/task.json, enabling selection of the current date/time as a variable source.
• Introduced a new input field DateTimeFormat in vsts-variable-set/v3/task.json for specifying the format of the date/time value, with help text describing supported patterns.
• Implemented the formatDateTime function in vsts-variable-set/v3/vsts-variable-set.ts to replace format patterns (e.g., yyyy, MM, dd, HH, mm, ss, tt) with the corresponding values from the current date/time.
• Updated the getValue function in vsts-variable-set/v3/vsts-variable-set.ts to handle the new "datetime" option and use the DateTimeFormat input for formatting.

Build info updates

• Updated TypeScript build info files (tsconfig.tsbuildinfo) for all versions of vsts-variable-set and vsts-variable-transform to reflect the current build version. [1] [2]

[Copilot]

Pull Request Overview

This PR adds datetime formatting capability to the variable set task, enabling users to set variables to the current date/time with custom formatting.

• Added a new "datetime" option to the variable source picker with configurable format patterns
• Implemented date/time formatting function supporting common patterns (yyyy, MM, dd, HH, mm, ss, tt)
• Updated TypeScript build info files across multiple task versions

Reviewed Changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 2 comments.

File	Description
vsts-variable-set/v3/task.json	Added "datetime" option to picker and new DateTimeFormat input field
vsts-variable-set/v3/vsts-variable-set.ts	Implemented formatDateTime function and datetime case in getValue
vsts-variable-set/v*/tsconfig.tsbuildinfo	Updated TypeScript build info to version 5.8.3
vsts-variable-transform/v*/tsconfig.tsbuildinfo	Updated TypeScript build info to version 5.8.3

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[Copilot]

The fallback default format conflicts with the task.json defaultValue. If DateTimeFormat is required (true), the fallback will never be used, making this redundant. Either make the input optional or remove the fallback.

Suggested change

	const format = tl.getInput("DateTimeFormat", true) || "yyyy-MM-dd HH:mm:ss";
	const format = tl.getInput("DateTimeFormat", true);

[Copilot]

The hh pattern for 12-hour format is not documented in the task.json helpMarkdown. The help text only mentions HH (24-hour) but not hh (12-hour).