SEAB-6174: fix fuzzing 500 errors

[hyunnaye]

Description This PR fixes various 500 errors found by the fuzzing tests.

Review Instructions Try the endpoints on QA and verify that it no longer returns 500s.

Issue https://ucsc-cgl.atlassian.net/browse/SEAB-6174

Security and Privacy

If there are any concerns that require extra attention from the security team, highlight them here and check the box when complete.

• [x] Security and Privacy assessed

e.g. Does this change...

• Any user data we collect, or data location?
• Access control, authentication or authorization?
• Encryption features?

Please make sure that you've checked the following before submitting your pull request. Thanks!

• [x] Check that you pass the basic style checks and unit tests by running mvn clean install
• [x] Ensure that the PR targets the correct branch. Check the milestone or fix version of the ticket.
• [x] Follow the existing JPA patterns for queries, using named parameters, to avoid SQL injection
• [x] If you are changing dependencies, check the Snyk status check or the dashboard to ensure you are not introducing new high/critical vulnerabilities
• [x] Assume that inputs to the API can be malicious, and sanitize and/or check for Denial of Service type values, e.g., massive sizes
• [x] Do not serve user-uploaded binary images through the Dockstore API
• [x] Ensure that endpoints that only allow privileged access enforce that with the @RolesAllowed annotation
• [x] Do not create cookies, although this may change in the future
• [x] If this PR is for a user-facing feature, create and link a documentation ticket for this feature (usually in the same milestone as the linked issue). Style points if you create a documentation PR directly and link that instead.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 74.48%. Comparing base (1550b54) to head (433929e). Report is 2 commits behind head on develop.

Files	Patch %	Lines
.../io/dockstore/webservice/core/CollectionEntry.java	0.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #5874 +/- ## ============================================= - Coverage 74.51% 74.48% -0.03% + Complexity 5246 5244 -2 ============================================= Files 368 368 Lines 18945 18947 +2 Branches 1992 1992 ============================================= - Hits 14117 14113 -4 - Misses 3879 3885 +6 Partials 949 949 ``` | [Flag](https://app.codecov.io/gh/dockstore/dockstore/pull/5874/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dockstore) | Coverage Δ | | |---|---|---| | [bitbuckettests](https://app.codecov.io/gh/dockstore/dockstore/pull/5874/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dockstore) | `27.23% <0.00%> (-0.01%)` | :arrow_down: | | [integrationtests](https://app.codecov.io/gh/dockstore/dockstore/pull/5874/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dockstore) | `58.88% <0.00%> (-0.03%)` | :arrow_down: | | [languageparsingtests](https://app.codecov.io/gh/dockstore/dockstore/pull/5874/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dockstore) | `11.08% <0.00%> (-0.01%)` | :arrow_down: | | [localstacktests](https://app.codecov.io/gh/dockstore/dockstore/pull/5874/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dockstore) | `21.71% <0.00%> (-0.01%)` | :arrow_down: | | [toolintegrationtests](https://app.codecov.io/gh/dockstore/dockstore/pull/5874/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dockstore) | `30.63% <0.00%> (-0.01%)` | :arrow_down: | | [unit-tests_and_non-confidential-tests](https://app.codecov.io/gh/dockstore/dockstore/pull/5874/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dockstore) | `28.57% <0.00%> (-0.01%)` | :arrow_down: | | [workflowintegrationtests](https://app.codecov.io/gh/dockstore/dockstore/pull/5874/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dockstore) | `38.88% <0.00%> (-0.01%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dockstore#carryforward-flags-in-the-pull-request-comment) to find out more.

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[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud