Fix for Liquibase upgrade failure due to NULL participantId

Fix for Liquibase upgrade failure due to NULL participantId

This fixes an intermittent upgrade issue when adding not-null
constraints to participant tables due to orphan entries with
NULL values. The fix is to delete rows with NULL entries before
adding the NOT NULL constraints. Since the changesets may have
already been deployed, we need to override the checksums to
avoid Liquibase checksum validation errors.

Issue-ID: POLICY-5486
Change-Id: Ic60b536a1118c3f22e32f04ef0d1c573917c0d20
Signed-off-by: danielhanrahan <daniel.hanrahan@est.tech>