Use component ID for input and label to avoid ID collisions

[zeroasterisk]

This PR addresses a bug where the input IDs were hardcoded as data in the Lit renderer, which made browser automation difficult.

I made what I believe are reasonable changes, but since Paul wrote the initial version of this, I seriously doubt my changes and worry that his initial version is better. I defer to @paullewis but present this as a possible PR

[gemini-code-assist]

Code Review

This pull request replaces hardcoded 'data' IDs and label associations with dynamic values using this.id in the DateTimeInput and TextField components. The reviewer identified that using this.id directly causes ID collisions with the host element and suggested using a derived ID like ${this.id}-input instead. Additionally, the reviewer noted that the name attribute remains hardcoded and requested the inclusion of tests for these changes.

[ditman]

Please update the ## Unreleased section of the CHANGELOG with a description of this change.

Also, please consider adding this functionality to the other renderers so we don't have diverging capabilities in the basic catalog components!

(Also, also: only land this if it's a super critical need! I'd rather have this fix in the v0.9 stack :))

[ditman]

how are you setting this id property? Is it directly in the DOM, or does it come from the agent?