test: add test to ensure immutable contracts cannot be changed

[lukelee-sl]

Description Increase test coverage for ContractUpdate

• [ ] Documented (Code comments, README, etc.)
• [x] Tested (unit, integration, etc.)

[codacy-production[bot]]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
Report missing for de34f1ca79a8dbc4faa88eb0321e4048714f2dbb[^1]	:white_check_mark: 71.43%

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (de34f1ca79a8dbc4faa88eb0321e4048714f2dbb) | Report Missing | Report Missing | Report Missing | | | Head commit (6b7a2ec9e7467a974903e3dc592c24db4ab8b258) | 110883 | 69259 | 62.46% | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#15092) | 7 | 5 | **71.43%** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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_{Codacy stopped sending the deprecated coverage status on June 5th, 2024. Learn more} [^1]: Codacy didn't receive coverage data for the commit, or there was an error processing the received data. Check your integration for errors and validate that your coverage setup is correct.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 14.28571% with 6 lines in your changes missing coverage. Please review.

Project coverage is 59.10%. Comparing base (964661d) to head (6b7a2ec). Report is 22 commits behind head on develop.

Files	Patch %	Lines
.../contract/impl/handlers/ContractUpdateHandler.java	14.28%	3 Missing and 3 partials :warning:

Additional details and impacted files

[](https://app.codecov.io/gh/hashgraph/hedera-services/pull/15092?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=hashgraph) ```diff @@ Coverage Diff @@ ## develop #15092 +/- ## =========================================== Coverage 59.10% 59.10% + Complexity 22549 22543 -6 =========================================== Files 2902 2897 -5 Lines 111299 111194 -105 Branches 11424 11411 -13 =========================================== - Hits 65783 65723 -60 + Misses 41827 41784 -43 + Partials 3689 3687 -2 ``` | [Files](https://app.codecov.io/gh/hashgraph/hedera-services/pull/15092?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=hashgraph) | Coverage Δ | | |---|---|---| | [.../contract/impl/handlers/ContractUpdateHandler.java](https://app.codecov.io/gh/hashgraph/hedera-services/pull/15092?src=pr&el=tree&filepath=hedera-node%2Fhedera-smart-contract-service-impl%2Fsrc%2Fmain%2Fjava%2Fcom%2Fhedera%2Fnode%2Fapp%2Fservice%2Fcontract%2Fimpl%2Fhandlers%2FContractUpdateHandler.java&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=hashgraph#diff-aGVkZXJhLW5vZGUvaGVkZXJhLXNtYXJ0LWNvbnRyYWN0LXNlcnZpY2UtaW1wbC9zcmMvbWFpbi9qYXZhL2NvbS9oZWRlcmEvbm9kZS9hcHAvc2VydmljZS9jb250cmFjdC9pbXBsL2hhbmRsZXJzL0NvbnRyYWN0VXBkYXRlSGFuZGxlci5qYXZh) | `67.30% <14.28%> (-2.18%)` | :arrow_down: | ... and [26 files with indirect coverage changes](https://app.codecov.io/gh/hashgraph/hedera-services/pull/15092/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=hashgraph) [](https://app.codecov.io/gh/hashgraph/hedera-services/pull/15092?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=hashgraph)