add copyright header to metadata.yaml.tmpl

[BBBmau]

Resolves hashicorp/terraform-provider-google#20174

This is due to #12061 introducing new files that did not include the hashicorp copyright header. I also added in the autogenerate header.

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[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.

google provider: Diff ( 485 files changed, 8245 insertions(+))
google-beta provider: Diff ( 550 files changed, 9350 insertions(+))

[wyardley]

Think these will probably need to be pound / hash symbol vs C / go style comments (# vs //)?

[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.

google provider: Diff ( 485 files changed, 8245 insertions(+))
google-beta provider: Diff ( 550 files changed, 9350 insertions(+))

[roaks3]

@BBBmau can you help me understand this a little better? Is it a hard requirement for all files to have the license header? And what about the generation type header? The generation type in particular seems a bit overkill to me considering these are only meant for housing a small amount of metadata.

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[roaks3]

Still waiting to hear back on whether we need this

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