Remove trailing '=' character from generated image tag hash value

[jasonlai1218]

Tracking issue

Why are the changes needed?

To remove = directly is more clarity

What changes were proposed in this pull request?

• remove trailing '=' character
• Add an assertion to check if the tag does not contain equal signs

How was this patch tested?

Setup process

FLYTE_SDK_LOGGING_LEVEL=20 pyflyte run --remote -p flytesnacks --domain development my_workflows/dev_image_spec.py wf

from flytekit import ImageSpec, task, workflow

flytekit_git_version = "git+https://github.com/jasonlai1218/flytekit.git@remove-equal-sign#commit=4c9ff81992692dbf5331fe8a04851cf36cb3761b"

py_image_spec = ImageSpec(
    name="test_version_1",
    registry="jasonlai1218",
    packages=[flytekit_git_version],
    apt_packages=["git"],
    env={"FLYTE_SDK_LOGGING_LEVEL": "20"},
)


@task(container_image=py_image_spec)
# @task
def t(a: int, b: int) -> int:
    return a + b


@workflow
def wf(a: int=5, b: int=3) -> int:
    out = t(a=a, b=b)
    return out

Screenshots

Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

Related PRs

Docs link

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.98%. Comparing base (1bb5067) to head (89b476c).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2240   +/-   ##
=======================================
  Coverage   85.98%   85.98%           
=======================================
  Files         320      320           
  Lines       24245    24250    +5     
  Branches     3666     3667    +1     
=======================================
+ Hits        20847    20852    +5     
  Misses       2746     2746           
  Partials      652      652           

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