r/app_cookie_stickiness_policy - remove custom validation and replace preconfig delete

[DrFaust92]

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Relates #11872, #13820

Release note for CHANGELOG:

resource_aws_app_cookie_stickiness_policy: add plan time validation to `lb_port`

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccAWSAppCookieStickinessPolicy_'
--- PASS: TestAccAWSAppCookieStickinessPolicy_basic (126.69s)
--- PASS: TestAccAWSAppCookieStickinessPolicy_missingLB (54.80s)
--- PASS: TestAccAWSAppCookieStickinessPolicy_disappears (65.50s)

[ghost]

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