fix(supergraph): Fix null check in error message

[qumberrizvi]

This PR fixes an error thrown by Typescript 5.x.

TS2869: Right operand of ?? is unreachable because the left operand is never nullish.

On line 163:

throw new UplinkFetcherError(fetchErrorMsg + result.status + ' ' + e.message ?? e);

Closes #3229

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