fix(lambda): save params before running sam command when --watch is selected

[mbfreder]

Problem

When --watch flag is used, the sync process remains alive. The region and stack_name info get written to config file only after the process finishes. This means customer would not be able to see (or refresh) the latest deployed resoures during the sync process.

Solution

Write to samconfig.toml before running sam sync

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License: I confirm that my contribution is made under the terms of the Apache 2.0 license.

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[mbfreder]

One test is failing here but not on my local machine. Investigating this.