[eventgrid] Fix nightly Min/Max CI issues

[ellismg]

Similar to #19862, we have recently started to see some issues in our
nightly min/max jobs that prevent us from saving the entire Response
object during the onResponse callback due to multiple imports of the
"same" type.

Similar to the resolution for #19862, I've decided to just not use
nominal types from core-client here and instead just stash away the
parts of the response I need inside the callback and observe the
values after.

Fixes #20014

[ellismg]

/azp run eventgrid - js - tests

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[ellismg]

/azp run js - eventgrid - tests

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[xirzec]

Thanks for resolving this! I think this is probably the best solution without having to bump the min version of core-client

[ellismg]

/azp run js - eventgrid - tests

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Azure Pipelines successfully started running 1 pipeline(s).