Fix error messages in extension log when quick evalling library files with CodeQL CLI v2.10.0

[henrymercer]

Currently resolve ml-models only supports queryspecs, i.e. .ql, .qls, directory, and query pack specifications. However, a quick evaluation within a library will have a path ending in .qll, and currently the extension tries to call resolve ml-models on this path, logging an error message like this to the extension log:

[2022-06-29 10:15:25] Calling plumbing command: codeql resolve queries --additional-packs=/home/edoardo/semmle-code/ql --qlconfig-file=/home/edoardo/semmle-code/ql/qlconfig.yml --format startingpacks -- /home/edoardo/semmle-code/ql/cpp/ql/lib/semmle/code/cpp/internal/ResolveClass.qll
A fatal error occurred: /home/edoardo/semmle-code/ql/cpp/ql/lib/semmle/code/cpp/internal/ResolveClass.qll is not a .ql file, .qls file, a directory, or a query pack specification.
[2022-06-29 10:15:25] Exception caught at top level: /home/edoardo/semmle-code/ql/cpp/ql/lib/semmle/code/cpp/internal/ResolveClass.qll is not a .ql file, .qls file, a directory, or a query pack specification.
                      com.semmle.cli2.resolve.ResolveQueriesCommand.resolveQuerySpecifier(ResolveQueriesCommand.java:237)
                      com.semmle.cli2.resolve.ResolveQueriesCommand.executeJSON(ResolveQueriesCommand.java:174)
                      com.semmle.cli2.resolve.ResolveQueriesCommand.executeJSON(ResolveQueriesCommand.java:71)
                      com.semmle.cli2.picocli.SimpleJsonSubcommand.executeInsistingOnJSON(SimpleJsonSubcommand.java:117)
                      com.semmle.cli2.picocli.PlumbingRunner.call(PlumbingRunner.java:54)
                      com.semmle.cli2.picocli.SubcommandCommon.callPlumbingInProcess(SubcommandCommon.java:126)
                      com.semmle.cli2.resolve.ResolveMlModelsCommand.resolvePackDependencies(ResolveMlModelsCommand.java:233)
                      com.semmle.cli2.resolve.ResolveMlModelsCommand.executeJSON(ResolveMlModelsCommand.java:92)
                      com.semmle.cli2.resolve.ResolveMlModelsCommand.executeJSON(ResolveMlModelsCommand.java:49)
                      com.semmle.cli2.picocli.SimpleJsonSubcommand.executeInsistingOnJSON(SimpleJsonSubcommand.java:117)
                      com.semmle.cli2.picocli.SimpleJsonSubcommand.executeSubcommand(SimpleJsonSubcommand.java:80)
                      com.semmle.cli2.picocli.SubcommandCommon.executeWithParent(SubcommandCommon.java:484)
                      com.semmle.cli2.execute.CliServerCommand.lambda$executeSubcommand$0(CliServerCommand.java:67)
                      com.semmle.cli2.picocli.SubcommandMaker.runMain(SubcommandMaker.java:205)
                      com.semmle.cli2.execute.CliServerCommand.executeSubcommand(CliServerCommand.java:67)
                      com.semmle.cli2.picocli.SubcommandCommon.call(SubcommandCommon.java:500)
                      com.semmle.cli2.picocli.SubcommandMaker.runMain(SubcommandMaker.java:205)
                      com.semmle.cli2.picocli.SubcommandMaker.runMain(SubcommandMaker.java:214)
                      com.semmle.cli2.CodeQL.main(CodeQL.java:98)

Couldn't resolve available ML models for /home/edoardo/semmle-code/ql/cpp/ql/lib/semmle/code/cpp/internal/ResolveClass.qll. Running the query without any ML models: Error: Resolving ML models failed: [2022-06-29 10:15:25] Calling plumbing command: codeql resolve queries --additional-packs=/home/edoardo/semmle-code/ql --qlconfig-file=/home/edoardo/semmle-code/ql/qlconfig.yml --format startingpacks -- /home/edoardo/semmle-code/ql/cpp/ql/lib/semmle/code/cpp/internal/ResolveClass.qll
A fatal error occurred: /home/edoardo/semmle-code/ql/cpp/ql/lib/semmle/code/cpp/internal/ResolveClass.qll is not a .ql file, .qls file, a directory, or a query pack specification.

With this PR, we no longer try to resolve ML models when doing a quick evaluation within a library. Instead, we print an informative message "Quick evaluation within a query library does not currently support using ML models. Continuing without any ML models." to the extension log.

Checklist

• CHANGELOG.md has been updated to incorporate all user visible changes made by this pull request.
• Issues have been created for any UI or other user-facing changes made by this pull request.
• [Maintainers only] If this pull request makes user-facing changes that require documentation changes, open a corresponding docs pull request in the github/codeql repo and add the ready-for-doc-review label there.