move export case to network conversion server

[EtienneLt]

Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• A PR or issue has been opened in all impacted repositories (if any)

Does this PR already have an issue describing the problem?
no

What kind of change does this PR introduce?
remove code as it is moved to powsybl network conversion server

What is the current behavior?

What is the new behavior (if this is a feature change)?
powsybl case srver does not convert case any more

Does this PR introduce a breaking change or deprecate an API?

• Yes
• No

If yes, please check if the following requirements are fulfilled

• The Breaking Change or Deprecated label has been added
• The migration steps are described in the following section

What changes might users need to make in their application due to this PR? (migration steps)
do not use export endpoint anymore and use convert endpoint in powsybl conversion server

Other information:
it is linked to these pr in network conversion server powsybl/powsybl-network-conversion-server#185

[antoinebhs]

Remove ExportCaseInfos (not used)
Remove:

    public static CaseException createCopyZipContentError(UUID uuid, Exception e) {
        return new CaseException(Type.ZIP_FILE_PROCESS, "Error copying zip content file: " + uuid, e);
    }

    public static CaseException createUnsupportedFormat(String format) {
        return new CaseException(Type.UNSUPPORTED_FORMAT, "The format: " + format + " is unsupported");
    }

(not used)
and

        ZIP_FILE_PROCESS,
        UNSUPPORTED_FORMAT

that are not used
See: c38a316#diff-15b959878419fa937da7a7fb04ad34aed18cdd30c0f437dbccb30117bc0a0537

[EtienneLt]

do I remove TEMP_FILE_PROCESS too ? @antoinebhs

[antoinebhs]

do I remove TEMP_FILE_PROCESS too ? @antoinebhs

If not used, yes

[antoinebhs]

Code OK

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
85.7% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud