[Avocado] Make Avocado support permanent suppressions via config

[konrad-jamrozik]

AutoRest plugins like LintDiff can be suppressed according to these instructions:

• https://dev.azure.com/azure-sdk/internal/_wiki/wikis/internal.wiki/85/Swagger-Suppression-Process
• https://dev.azure.com/azure-sdk/internal/_wiki/wikis/internal.wiki/828/How-to-suppress-validation-rules

Avocado cannot be suppressed like that (i.e. via AutoRest config file, i.e. the README). It can only by be suppressed for given PR by adding Approved-Avocado label.

Avocado cannot be suppressed permanently as it is not an AutoRest plugin.

The Avocado call chain looks like that:

• Avocado.yml invocation from .azure-pipelines.yml
• script: './node_modules/.bin/avocado -f pipe.log --excludePaths "/common-types/" "/scenarios/" "/package.json" "/package-lock.json" "/cadl/examples/" --includePaths "data-plane" "resource-manager"' invocation from Avocado.yml
• avocado function definition

This work item is about making it possible to suppress Avocado permanently.

One possible way to solve this is to make Avocado read and interpret the AutoRest suppression syntax. Avocado is already reading the AutoRest config file (the README) as part of its implementation. This would require reimplementing the AutoRest suppression parsing logic, including json path parsing, inside Avocado.

[konrad-jamrozik]

For example, multiple default tags error should be suppressed for Microsoft.Resources namespace. See this Teams thread.

[konrad-jamrozik]

Delaying this item as we made Avocado non-blocking few months ago.