r/vpn_connection: replace DescribeTransitGatewayAttachments with paginated method

[anGie44]

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Notes

• (From Customer): At a large number of AWS Transit Gateway Attachments (999+), the AWS API call DescribeTransitGatewayAttachments will return an initial empty response with pagination token even when querying for a unique TGW Attachment. This results in the error "error finding EC2 VPN Connection (%s) Transit Gateway Attachment: empty response".

Output from acceptance testing:

--- PASS: TestAccAWSVpnConnection_tunnelOptions (338.05s)
--- PASS: TestAccAWSVpnConnection_Tunnel1PresharedKey (229.08s)
--- PASS: TestAccAWSVpnConnection_Tunnel1InsideCidr (310.85s)
--- PASS: TestAccAWSVpnConnection_specifyIpv4 (311.84s)
--- PASS: TestAccAWSVpnConnection_tunnelOptionsLesser (313.71s)
--- PASS: TestAccAWSVpnConnection_withoutStaticRoutes (390.94s)
--- PASS: TestAccAWSVpnConnection_disappears (531.94s)
--- PASS: TestAccAWSVpnConnection_tags (570.34s)
--- PASS: TestAccAWSVpnConnection_withIpv6 (648.72s)
--- PASS: TestAccAWSVpnConnection_withEnableAcceleration (652.61s)
--- PASS: TestAccAWSVpnConnection_TransitGatewayID (652.65s)
--- PASS: TestAccAWSVpnConnection_Tunnel1InsideIpv6Cidr (712.52s)
--- PASS: TestAccAWSVpnConnection_basic (795.24s)
--- PASS: TestAccAWSVpnConnection_specifyIpv6 (476.51s)

[ewbankkit]

LGTM 🚀.

[github-actions]

This functionality has been released in v3.57.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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