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Update Workhorse and Gitaly to fix a security issue

See merge request gitlab/gitlabhq!3499

Escape namespace in label references

Closes #2941

See merge request gitlab/gitlabhq!3509

Use Gitlab::HTTP for all chat notifications

See merge request gitlab/gitlabhq!3517

GitLab stores AWS, Slack, Askimet, reCaptcha tokens in plaintext

See merge request gitlab/gitlabhq!3518

Prevent guests from seeing commits for cycle analytics

See merge request gitlab/gitlabhq!3519

Fix private comment Elasticsearch leak

See merge request gitlab/gitlabhq!3521

Hide AWS secret on Admin Integration page

See merge request gitlab/gitlabhq!3525

Related Branches Visible to Guests in Issue Activity

See merge request gitlab/gitlabhq!3537

Fix invalid byte sequence

See merge request gitlab/gitlabhq!3545

Check permissions before showing a forked project's source

See merge request gitlab/gitlabhq!3554

Ensure attributes that end in `_ids` are cleaned

See merge request gitlab/gitlabhq!3561

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We had concerns about the cached values on Redis with the previous two
releases strategy:

First release (this commit):
  - Create new encrypted fields in the database.
  - Start populating new encrypted fields, read the encrypted fields or
    fallback to the plaintext fields.
  - Backfill the data removing the plaintext fields to the encrypted
    fields.
Second release:
  - Remove the virtual attribute (created in step 2).
  - Drop plaintext columns from the database (empty columns after
    step 3).

We end up with a better strategy only using migration scripts in one
release:
  - Pre-deployment migration: Add columns required for storing encrypted
    values.
  - Pre-deployment migration: Store the encrypted values in the new
    columns.
  - Post-deployment migration: Remove the old unencrypted columns

This is the plan to encrypt the plaintext tokens:

First release (this commit):
  1. Create new encrypted fields in the database.
  2. Start populating new encrypted fields, read the encrypted fields or
     fallback to the plaintext fields.
  3. Backfill the data removing the plaintext fields to the encrypted fields.

Second release:
  4. Remove the virtual attribute (created in step 2).
  5. Drop plaintext columns from the database (empty columns after step 3).

This prevents an issue where you can steal other projects objects by
asking for ids that don't belong to you in import.