r/aws_load_balancer_policy: suppress computed policy_attribute diffs

[anGie44]

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Closes #2867
Closes #995

Output from acceptance testing (commercial):

--- PASS: TestAccELBPolicy_basic (24.17s)
--- PASS: TestAccELBPolicy_LBCookieStickinessPolicyType_computedAttributesOnly (24.19s)
--- PASS: TestAccELBPolicy_SSLNegotiationPolicyType_computedAttributesOnly (40.09s)
--- PASS: TestAccELBPolicy_SSLSecurityPolicy_predefined (43.73s)
--- PASS: TestAccELBPolicy_updateWhileAssigned (47.47s)
--- PASS: TestAccELBPolicy_SSLNegotiationPolicyType_customPolicy (47.48s)
--- PASS: TestAccELBPolicy_disappears (63.98s)

[gdavison]

Looks good 🚀

--- PASS: TestAccELBPolicy_basic (43.59s)
--- PASS: TestAccELBPolicy_LBCookieStickinessPolicyType_computedAttributesOnly (51.87s)
--- PASS: TestAccELBPolicy_SSLNegotiationPolicyType_computedAttributesOnly (58.22s)
--- PASS: TestAccELBPolicy_disappears (78.84s)
--- PASS: TestAccELBPolicy_updateWhileAssigned (79.88s)
--- PASS: TestAccELBPolicy_SSLNegotiationPolicyType_customPolicy (89.50s)
--- PASS: TestAccELBPolicy_SSLSecurityPolicy_predefined (89.75s)

[github-actions]

This functionality has been released in v3.73.0 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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