Improve GridFieldExportButton export csv filename

[3Dgoo]

Description

Currently the GridFieldExportButton export filename is always the following no matter what the model is:

export-$now.csv

With a date format of:

d-m-Y-H-i

The developer cannot modify this. If the cms user is exporting multiple models, they all have the same name, making it hard to differentiate between exports. The time stamp of d-m-Y-H-i is not necessarily ideal for sorting reasons and also is not configureable.

It would be great to update the filename to something this:

[classname]-export-[timestamp].csv

With a default date format of:

Y-m-d-H-i

The [classname] would automatically be replaced with the model classname. Resulting in the following example filenames:

order-export-2024-11-07-23-15.csv
product-export-2024-11-07-23-16.csv

The filename and date format should also be changed on a per button basis through the code.

Additional context or points of discussion

No response

Validations

• You intend to implement the feature yourself
• You have read the contributing guide
• You strongly believe this feature should be in core, rather than being its own community module
• You have checked for existing issues or pull requests related to this feature (and didn't find any)