fix: provide more useful error message on duplicate keys in template

[garrettdieckmann]

If a mustache view contains data that will cause duplicate keys in the rendered template, when f5-fast-core enters post-processing, yaml.load will return an error similar to:

duplicated mapping key (41:13)

38 |
39 |
40 |
41 |             \"shouldDup\": {
------------------^
42 |                 \"pool\": \"shouldDup\",
43 |               \"persistenceMethods\": [],

The error does not contain enough context for a end-user to understand how to resolve the duplicate keys on their own.

On a duplicate mapping key error, this change updates the error message to be similar to:

parameters must have unique values. The parameter value "shouldDup" is duplicated across parameters and you must update the parameter values to ensure they are unique.

Additional changes in this MR:

• rolled back Axios to ^0.27.2
• update to package lock to resolve npm vulnerabilities

[andreykashcheev]

Looks good!