Add jsonpath string to jsonpath assertion error message

[lehmannk]

Description

This PR adds the jsonpath string to the jsonpath assertion error message so it is easier to understand the actual error.

Motivation and Context

Currently, the jsonpath error produced when a mismatch occurs is not easy to understand because it does not contain the underlying analyzed jsonpath.

Example:

Assertion error:false
Assertion failure:true
Assertion failure message:Value expected to be 'true', but found '[]'

There is no way to understand what is expected to be 'true' here.

Thus, the actual jsonpath which caused the error shall be added, example:

Assertion error:false
Assertion failure:true
Assertion failure message:Value in json path '$.response.valid' expected to be 'true', but found '[]'

How Has This Been Tested?

tested locally

Screenshots (if appropriate):

Types of changes

• New feature (non-breaking change which adds functionality)

Checklist:

• [ x] My code follows the code style of this project.
• [ x] I have updated the documentation accordingly.

[vlsi]

The change looks good to me, however, please change the other throw statements in doAssert method in the same manner.

[lehmannk]

modified the requested statements and fixed unit tests accordingle

[lehmannk]

Hi @vlsi can you finally approve this PR? All your requested changes are incorporated.