r/aws_medialive_multiplex: handle read failure during delete

[jar-b]

Description

• Fixes an error which was silently swallowed by a diagnostic helper that did not append to the response Diagnostics field.
• Fixes generated tagging tests for the aws_medialive_multiplex resource.
• Removes unused helpers from the create package.

Output from Acceptance Testing

% make testacc PKG=medialive TESTS=TestAccMediaLive_serial/Multiplex/basic
make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.22.7 test ./internal/service/medialive/... -v -count 1 -parallel 20 -run='TestAccMediaLive_serial/Multiplex/basic'  -timeout 360m

--- PASS: TestAccMediaLive_serial (129.39s)
    --- PASS: TestAccMediaLive_serial/MultiplexProgram (74.15s)
        --- PASS: TestAccMediaLive_serial/MultiplexProgram/basic (74.15s)
    --- PASS: TestAccMediaLive_serial/Multiplex (55.23s)
        --- PASS: TestAccMediaLive_serial/Multiplex/basic (55.23s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/medialive  134.612s

% make testacc PKG=medialive TESTS=TestAccMediaLive_serial/Multiplex/updateTags
make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.23.1 test ./internal/service/medialive/... -v -count 1 -parallel 20 -run='TestAccMediaLive_serial/Multiplex/updateTags'  -timeout 360m

--- PASS: TestAccMediaLive_serial (1366.68s)
    --- PASS: TestAccMediaLive_serial/Multiplex (1366.68s)
        --- PASS: TestAccMediaLive_serial/Multiplex/updateTags (1366.68s)
            --- PASS: TestAccMediaLive_serial/Multiplex/updateTags/ComputedTag_OnUpdate_Replace (89.24s)
            --- PASS: TestAccMediaLive_serial/Multiplex/updateTags/EmptyTag_OnUpdate_Replace (69.56s)
            --- PASS: TestAccMediaLive_serial/Multiplex/updateTags/ComputedTag_OnCreate (60.76s)
            --- PASS: TestAccMediaLive_serial/Multiplex/updateTags/DefaultTags_updateToProviderOnly (70.58s)
            --- PASS: TestAccMediaLive_serial/Multiplex/updateTags/DefaultTags_updateToResourceOnly (66.00s)
            --- PASS: TestAccMediaLive_serial/Multiplex/updateTags/DefaultTags_nullOverlappingResourceTag (56.95s)
            --- PASS: TestAccMediaLive_serial/Multiplex/updateTags/basic (101.66s)
            --- PASS: TestAccMediaLive_serial/Multiplex/updateTags/EmptyTag_OnUpdate_Add (107.59s)
            --- PASS: TestAccMediaLive_serial/Multiplex/updateTags/DefaultTags_nonOverlapping (92.64s)
            --- PASS: TestAccMediaLive_serial/Multiplex/updateTags/DefaultTags_overlapping (93.36s)
            --- PASS: TestAccMediaLive_serial/Multiplex/updateTags/DefaultTags_emptyResourceTag (57.71s)
            --- PASS: TestAccMediaLive_serial/Multiplex/updateTags/ComputedTag_OnUpdate_Add (71.31s)
            --- PASS: TestAccMediaLive_serial/Multiplex/updateTags/null (61.18s)
            --- PASS: TestAccMediaLive_serial/Multiplex/updateTags/AddOnUpdate (70.43s)
            --- PASS: TestAccMediaLive_serial/Multiplex/updateTags/DefaultTags_providerOnly (105.57s)
            --- PASS: TestAccMediaLive_serial/Multiplex/updateTags/DefaultTags_nullNonOverlappingResourceTag (57.85s)
            --- PASS: TestAccMediaLive_serial/Multiplex/updateTags/EmptyMap (62.57s)
            --- PASS: TestAccMediaLive_serial/Multiplex/updateTags/EmptyTag_OnCreate (71.73s)
    --- PASS: TestAccMediaLive_serial/MultiplexProgram (0.00s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/medialive  1371.937s

[github-actions[bot]]

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[github-actions[bot]]

This functionality has been released in v5.69.0 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!