Fix userdata details being improperly serialized

[bddvlpr]

As of this PR, the provider incorrectly passes user data details to CloudStack, causing templates to render improperly without producing any visible errors.

The provider currently sends user data details in the following format:

{value=VALUE HERE, key=KEY HERE}

However, recent versions of CloudStack expect details to be provided as key-value pairs in the following format:

{KEY HERE=VALUE HERE}

The previously used format appears to be deprecated or is no longer supported, resulting in user data not being processed correctly. This issue has already been fixed upstream in cloudstack-go apache/cloudstack-go@3aaf3aa which is included in v2.19.0.

[Copilot]

Pull request overview

This PR updates the provider’s handling of userdata_details for CloudStack instances by switching to the newer CloudStack API expectations (key-value pairs), aligning behavior with the upstream fix in cloudstack-go and preventing user data templates from rendering incorrectly.

Changes:

• Bump github.com/apache/cloudstack-go/v2 from v2.18.1 to v2.19.0 (includes upstream userdata details serialization fix).
• Update cloudstack_instance create/update logic to pass userdata_details as {KEY=VALUE} rather than the deprecated/incorrect indexed format.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 2 comments.

File	Description
go.mod	Updates cloudstack-go dependency to v2.19.0.
go.sum	Updates checksums for the cloudstack-go version bump.
cloudstack/resource_cloudstack_instance.go	Changes instance create/update to set user data details as direct key-value pairs for CloudStack.

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