test: tweak smoke test tool bodies to standardize response text

Tweak the tool bodies for smoke test GPTScripts to reduce ambiguity in
the response. This prevents models -- like gpt-4o -- from doing things
like failing to interpolate strings consistently between runs.

Signed-off-by: Nick Hale <4175918+njhale@users.noreply.github.com>

Author: njhale

pkg/tests/smoke/testdata/Bob/test.gpt

@@ -1,10 +1,10 @@
 tools: bob
 
-Ask Bob "how are you doing" and repeat his reply exactly.
+Ask Bob "how are you doing" and repeat the response text exactly as given without saying anything else.
 
 ---
 name: bob
 description: I'm Bob, a friendly guy.
 args: question: The question to ask Bob.
 
-When asked how I am doing, respond with exactly "Thanks for asking "${QUESTION}", I'm doing great fellow friendly AI tool!"
+When asked how I am doing, respond with the following exactly: "Thanks for asking '${question}'! I'm doing great fellow friendly AI tool!" with ${question} replaced with the question text as given.

pkg/tests/smoke/testdata/BobAsShell/test.gpt

@@ -1,7 +1,6 @@
-
 tools: bob
 
-Ask Bob "how are you doing" and repeat his reply exactly.
+Ask Bob "how are you doing" and repeat the response text exactly as given without saying anything else.
 
 ---
 name: bob