Change log level on pixi interpreter discovery to reduce confusion (#24164)

Reference: #23773 and
#23773 (comment)

It seems that pixi warnings may be confusing unnecessary confusion among
folks who may not even intend to use pixi environment. Changing log
level for clarity and further help diagnosing problems that may be
unrelated to pixi.

Author: anthonykim1

src/client/pythonEnvironments/common/environmentManagers/pixi.ts

@@ -273,7 +273,7 @@ export async function getPixiEnvironmentFromInterpreter(
     // Find the pixi executable for the project
     pixi = pixi || (await Pixi.getPixi());
     if (!pixi) {
-        traceWarn(`could not find a pixi interpreter for the interpreter at ${interpreterPath}`);
+        traceVerbose(`could not find a pixi interpreter for the interpreter at ${interpreterPath}`);
         return undefined;
     }