feat: add network existance check before applying modification

[GhilesA]

PR Summary

For unloaded studies, we do not apply modification if we can't find the network.
this may be temporary before the refactore of the create+apply modification endpoint.

[coderabbitai]

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[etiennehomer]

You also need to override the iidm-impl version.
We usually override the version of the 3 network-store artefacts

Suggested change

	</dependency>
	</dependency>
	<!-- FIXME: to be removed at next release of gridsuite-dependencies or powsybl-ws-dependencies -->
	<dependency>
	<groupId>com.powsybl</groupId>
	<artifactId>powsybl-network-store-iidm-impl</artifactId>
	<version>${network-store.version}</version>
	</dependency>
	<!-- FIXME: to be removed at next release of gridsuite-dependencies or powsybl-ws-dependencies -->
	<dependency>
	<groupId>com.powsybl</groupId>
	<artifactId>powsybl-network-store-model</artifactId>
	<version>${network-store.version}</version>
	</dependency>

[etiennehomer]

done

[sonarqubecloud]

Quality Gate passed

Issues
4 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

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