Fix ts failure

[rchiodo]

This error is happening here:

TSError: ⨯ Unable to compile TypeScript:
##[error]src/client/datascience/notebook/helpers/helpers.ts(65,66): error TS2322: Type '{ name: string; } | { name: string; codemirror_mode?: string | JSONObject | undefined; file_extension?: string | undefined; mimetype?: string | undefined; pygments_lexer?: string | undefined; } | { ...; }' is not assignable to type 'ILanguageInfoMetadata | undefined'.
  Type '{ name: string; codemirror_mode?: string | JSONObject | undefined; file_extension?: string | undefined; mimetype?: string | undefined; pygments_lexer?: string | undefined; }' is not assignable to type 'ILanguageInfoMetadata'.
    Property 'codemirror_mode' is incompatible with index signature.
      Type 'string | JSONObject | undefined' is not assignable to type 'JSONValue'.
        Type 'undefined' is not assignable to type 'JSONValue'.

Caused by my submission this morning.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities (and 0 Security Hotspots to review)
0 Code Smells

No Coverage information
0.0% Duplication

[codecov-commenter]

Codecov Report

Merging #13545 into master will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master   #13545      +/-   ##
==========================================
- Coverage   59.75%   59.72%   -0.03%     
==========================================
  Files         670      670              
  Lines       37410    37410              
  Branches     5369     5369              
==========================================
- Hits        22353    22344       -9     
- Misses      13895    13901       +6     
- Partials     1162     1165       +3     

Impacted Files	Coverage Δ
src/client/datascience/notebook/helpers/helpers.ts	39.41% <100.00%> (ø)
src/client/common/utils/platform.ts	64.70% <0.00%> (-11.77%)	⬇️
src/client/datascience/crossProcessLock.ts	79.41% <0.00%> (-11.77%)	⬇️
src/client/linters/pydocstyle.ts	86.66% <0.00%> (-2.23%)	⬇️
src/client/datascience/debugLocationTracker.ts	76.56% <0.00%> (-1.57%)	⬇️
src/client/common/process/proc.ts	14.49% <0.00%> (-0.73%)	⬇️

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