fix: staticcheck ST1005

[tenthirtyam]

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Summary of Pull Request

Resolves "error strings should not be capitalized (ST1005)" from staticcheck.

➜ staticcheck ./... | grep "error strings should not be capitalized"
vmc/resource_vmc_sddc.go:656:11: error strings should not be capitalized (ST1005)
vmc/sddcgroup/sddc_group_client.go:148:25: error strings should not be capitalized (ST1005)
vmc/sddcgroup/sddc_group_client.go:312:36: error strings should not be capitalized (ST1005)
vmc/sddcgroup/sddc_group_client.go:315:36: error strings should not be capitalized (ST1005)
vmc/task/task_v2_client.go:87:18: error strings should not be capitalized (ST1005)

terraform-provider-vmc on  main [$!] via 🐹 v1.23.2 
➜ staticcheck ./... | grep "error strings should not be capitalized"

terraform-provider-vmc on  main [$!] via 🐹 v1.23.2 

Type of Pull Request

• [x] This is a bug fix.
• [ ] This is an enhancement or feature.
• [ ] This is a code style/formatting update.
• [ ] This is a documentation update.
• [ ] This is a refactoring update.
• [ ] This is a chore update
• [ ] This is something else. Please describe:

Related to Existing Issues

Issue Number: N/A

Test and Documentation Coverage

For bug fixes or features:

• [x] Tests have been completed.
• [ ] Documentation has been added/updated.

Breaking Changes?

• [ ] Yes, there are breaking changes.
• [x] No, there are no breaking changes.