Replace `except:` and `except Exception:` with a more granular exception

[parthea]

See feedback from gemini in PR googleapis/gapic-generator-python#2549:

googleapis/gapic-generator-python#2549 (comment)

The except: on the next line is a bare except, which is a bad practice as it catches all exceptions, including system-exiting ones like SystemExit and KeyboardInterrupt. This can make debugging difficult and hide underlying issues. It would be better to catch a more specific exception, like Exception.

While there's a TODO in the template to remove this try/except block, improving it in the meantime would be beneficial.

This change should be applied to the template file: gapic/templates/%namespace/%name_%version/%sub/services/%service/_shared_macros.j2.

Suggested change in the template:

        except Exception:

We should remove all usages of except: and replace them with except Exception: or a more granular exception

Search results for except:

https://github.com/search?q=repo%3Agoogleapis%2Fgapic-generator-python%20except%3A&type=code

Search results for except Exception:
https://github.com/search?q=repo%3Agoogleapis%2Fgapic-generator-python+%22except+Exception%3A%22&type=code

[parthea]

Transferring to google-cloud-python as the code for gapic-generator will be migrated there.