Don't add write only fields for tgc

[zli82016]

Don't add write only fields for tgc, as the write only fields are not in input of tfplan2cai, tfplan json.

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[melinath]

I think we should handle this with Compiler instead of adding a new ProviderName field that contains the same information.

Also, it would be good to change the code to set Compiler at load time instead of MMv1 provider instantiation, similar to #16217, to avoid problems later. (We should probably also only set compiler on the Product and always read if from there instead of duplicating it onto resources, if possible.)

[zli82016]

/gcbrun

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

terraform-google-conversion: Diff ( 8 files changed, 3 insertions(+), 194 deletions(-))