Add Status column to TrustedTimestamp entity

[loic-sharma]

During signature validation, TrustedTimestamp that are no longer trusted are treated as if they don't exist. Today, we have to manually inspect a timestamp and its certificates to determine whether the timestamp is valid and trusted. This new Status column will be updated to reflect timestamps' latest known status, thereby making it easier to filter out TrustedTimestamps that are no longer trusted during package signature validation.

⚠️ NOTE: The default Status is Invalid. After we run the migrations, ALL TrustedTimestamps will be marked as Invalid. We will need to fix the E&V job to properly mark TrustedTimestamps as Valid, then, TrustedTimestamps in the database will need to be fixed up with the following SQL query:

DECLARE @invalidTimestampStatus int = 0;
DECLARE @validTimestampStatus int = 1;

DECLARE @validCertificateStatus int = 1;

UPDATE [signature].[TrustedTimestamps]
SET [Status] = @validTimestampStatus
WHERE [Key] in (
    SELECT TOP 100 t.[Key]
    FROM [signature].[TrustedTimestamps] t
    INNER JOIN [signature].[EndCertificates] c
    ON t.[EndCertificateKey] = c.[Key]
    WHERE
        t.[Status] = @invalidTimestampStatus AND
        c.[Status] = @validCertificateStatus
)