fix Pre Hook Exception in case _controller is not stringable

[trigrab]

closes https://github.com/open-telemetry/opentelemetry-php/issues/1569

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 83.46%. Comparing base (e6272aa) to head (a8c7f8e). Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #366   +/-   ##
=========================================
  Coverage     83.45%   83.46%           
- Complexity     1957     1958    +1     
=========================================
  Files           143      143           
  Lines          8190     8193    +3     
=========================================
+ Hits           6835     6838    +3     
  Misses         1355     1355           

Flag	Coverage Δ
Aws	92.59% <ø> (ø)
Context/Swoole	0.00% <ø> (ø)
Instrumentation/AwsSdk	81.13% <ø> (ø)
Instrumentation/CakePHP	20.40% <ø> (ø)
Instrumentation/CodeIgniter	73.55% <ø> (ø)
Instrumentation/Curl	90.42% <ø> (ø)
Instrumentation/Doctrine	91.98% <ø> (ø)
Instrumentation/ExtAmqp	88.48% <ø> (ø)
Instrumentation/ExtRdKafka	86.11% <ø> (ø)
Instrumentation/Guzzle	75.58% <ø> (ø)
Instrumentation/HttpAsyncClient	78.04% <ø> (ø)
Instrumentation/IO	70.68% <ø> (ø)
Instrumentation/Laravel	69.68% <ø> (ø)
Instrumentation/MongoDB	74.28% <ø> (ø)
Instrumentation/MySqli	95.81% <ø> (ø)
Instrumentation/OpenAIPHP	87.21% <ø> (ø)
Instrumentation/PDO	94.21% <ø> (ø)
Instrumentation/Psr14	76.47% <ø> (ø)
Instrumentation/Psr15	89.15% <ø> (ø)
Instrumentation/Psr16	97.50% <ø> (ø)
Instrumentation/Psr18	77.46% <ø> (ø)
Instrumentation/Psr3	67.01% <ø> (ø)
Instrumentation/Psr6	97.61% <ø> (ø)
Instrumentation/ReactPHP	99.45% <ø> (ø)
Instrumentation/Slim	86.11% <ø> (ø)
Instrumentation/Symfony	84.88% <100.00%> (+0.14%)	:arrow_up:
Instrumentation/Yii	77.50% <ø> (ø)
Logs/Monolog	100.00% <ø> (ø)
Propagation/Instana	98.11% <ø> (ø)
Propagation/ServerTiming	100.00% <ø> (ø)
Propagation/TraceResponse	100.00% <ø> (ø)
ResourceDetectors/Azure	91.66% <ø> (ø)
ResourceDetectors/Container	93.02% <ø> (ø)
ResourceDetectors/DigitalOcean	100.00% <ø> (ø)
Sampler/RuleBased	33.51% <ø> (ø)
Shims/OpenTracing	92.45% <ø> (ø)
Symfony	87.81% <ø> (ø)
Utils/Test	87.53% <ø> (ø)

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Files with missing lines	Coverage Δ
...rumentation/Symfony/src/SymfonyInstrumentation.php	80.18% <100.00%> (+0.55%)	:arrow_up:

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