Fix the test TestAccApigeeInstance_apigeeInstanceServiceAttachmentBas…

[zli82016]

hashicorp/terraform-provider-google#12529

The field consumer_accept_list accepts the list of project id/number. The test fails because when the user enters project numbers for the field, the API returns project ids in the response.

The workaround is to suppress the diff as long as the number of entries in the list are the same.

If this PR is for Terraform, I acknowledge that I have:

• Searched through the issue tracker for an open issue that this either resolves or contributes to, commented on it to claim it, and written "fixes {url}" or "part of {url}" in this PR description. If there were no relevant open issues, I opened one and commented that I would like to work on it (not necessary for very small changes).
• Generated Terraform, and ran make test and make lint to ensure it passes unit and linter tests.
• Ensured that all new fields I added that can be set by a user appear in at least one example (for generated resources) or third_party test (for handwritten resources or update tests).
• Ran relevant acceptance tests (If the acceptance tests do not yet pass or you are unable to run them, please let your reviewer know).
• Read the Release Notes Guide before writing my release note below.

Release Note Template for Downstream PRs (will be copied)

apigee: Fixed permadiff on consumer_accept_list for `google_apigee_instance`

[modular-magician]

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[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

Terraform GA: Diff ( 2 files changed, 141 insertions(+), 4 deletions(-))
Terraform Beta: Diff ( 2 files changed, 141 insertions(+), 4 deletions(-))
TF Validator: Diff ( 3 files changed, 34 insertions(+), 4 deletions(-))

[modular-magician]

Tests analytics

Total tests: 2222
Passed tests 1981
Skipped tests: 240
Failed tests: 1

Action taken

Triggering VCR tests in RECORDING mode for the tests that failed during VCR. Click here to see the failed tests

TestAccFirebaserulesRelease_BasicRelease

[modular-magician]

Tests passed during RECORDING mode:
TestAccFirebaserulesRelease_BasicRelease[Debug log]

All tests passed
View the build log or the debug log for each test

[c2thorn]

Sorry for the delay. This looks great, thank you @zli82016

[zli82016]

Thanks for the code review.