fix(webaclv2): WAFv2 rule loss when making an update."

[fyqtian]

Description

After creating WAFv2 with the rule_json field, updating other fields without including rule_json will set the rules to empty."

Relations

Closes #0000

References

Output from Acceptance Testing

 make testacc TESTS=TestAccWAFV2WebACL_basic PKG=wafv2                                                                                                                                                                               INT ✘  15:48:44 
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.22.6 test ./internal/service/wafv2/... -v -count 1 -parallel 20 -run='TestAccWAFV2WebACL_basic'  -timeout 360m
=== RUN   TestAccWAFV2WebACL_basic
=== PAUSE TestAccWAFV2WebACL_basic
=== CONT  TestAccWAFV2WebACL_basic
--- PASS: TestAccWAFV2WebACL_basic (36.76s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/wafv2      40.515s

...

[github-actions]

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[github-actions]

Welcome @fyqtian 👋

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