chore: updated Makefile and mmv builder

[modular-magician]

• Chain the two go run commands in the mmv1 make target with && (edit: did a narrower fix here than in the initial PR)
  With this, the error in the linked ticket will now exit on provider build failure instead of continuing to the next step and exiting 0:

F1112 22:07:54.227629   53015 examples.go:300] template: artifact_registry_repository.go.tmpl:12: function "project" not defined
2024/11/12 22:07:54 products/dialogflowcx not specified, skipping generation
2024/11/12 22:07:54 products/iambeta not specified, skipping generation
2024/11/12 22:07:54 products/securitycenter not specified, skipping generation
2024/11/12 22:07:54 products/privateca not specified, skipping generation
exit status 1
make[1]: *** [mmv1] Error 1
make: *** [provider] Error 2
% echo $?
2

• Added the product being built in the case where forceProvider is set to an empty string, and changed prefix to "Building" vs "Using"

This avoids the extra space and missing provider type that show up when building the default (Terraform) provider:

2024/11/12 20:14:47 Using ga version
2024/11/12 20:14:47 Using  provider

in favor of:

2024/11/12 22:23:30 Building ga version
2024/11/12 22:23:30 Building default (terraform) provider

• Also fixed missing space here:

2024/11/12 22:40:26 Unexpected output folder (--version) detectedwhen deciding to add HashiCorp copyright headers.

Fixes #20317

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Derived from GoogleCloudPlatform/magic-modules#12314