Fixes m81 drivers

[FelixDollinger-SweepMe]

• Typos / unit formatting
• Check channel selection during initialize, not during apply_gui_parameters to avoid raising errors too early.

[gemini-code-assist]

Summary of Changes

Hello @FelixDollinger-SweepMe, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request primarily focuses on enhancing the robustness and user experience of the M81 instrument drivers. It refactors the channel selection validation to occur earlier in the instrument's lifecycle, preventing premature errors during GUI parameter application. Additionally, it standardizes unit formatting in GUI labels and improves the clarity of device-checking error messages, making the drivers more reliable and user-friendly.

Highlights

• Improved Channel Validation Logic: The channel selection validation has been moved from apply_gui_parameters to initialize in the LCRmeter driver. This prevents premature errors and ensures device modules are checked for correctness (VS-10 and CM-10) at an appropriate stage.
• Enhanced GUI Parameter Handling: The LCRmeter driver now stores the full channel string in a dedicated self.channel attribute. In both LCRmeter and SMU drivers, GUI parameter labels for voltage limits and sweep modes have been updated for clearer unit formatting (e.g., "Voltage in V").
• Refined Error Messages and Typos: Error messages in the check_device method for both drivers have been made more descriptive, explicitly mentioning "module". Minor typos, such as "Lakeshore" to "LakeShore", have also been corrected.
• SMU Driver Shortname Update: The shortname format for the SMU driver has been updated from SMU VS-10 S#/ CM-10 M# to SMU @ S# + M# for conciseness.

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[gemini-code-assist]

Code Review

The pull request effectively addresses several typos and unit formatting inconsistencies across both the LCRmeter and SMU drivers for the Lakeshore M81. The change to defer channel validation from apply_gui_parameters to initialize is noted, aligning with the stated goal of avoiding early errors. However, there's a potential issue with how invalid channel formats are handled after this deferral, which could lead to less informative runtime errors.